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Parental separation may affect the child’s development. Early parental divorce (during primary school) has been associated with greater internalising and externalising behaviour problems in the child, while later divorce may dampen academic performance. Children to unmarried parents tend to suffer greater emotional and social difficulties than others do.

Whereas father absence mainly result from parental divorce and separation, other factors such as family poverty, mixed or Black (compared to White) ethnicity have also been linked to the a greater likelihood of the father being absent when the child is 3 years old.

General Problems
Despite limited conclusiveness among researchers regarding the exact significance of fathering, fathers are traditionally deemed a provider of protection and support for the child’s development. Through a number of pathways, father absence may influence child behaviour especially in early and middle childhood. These include a decline in household income and ineffective parenting arisen from continued conflicts and psychological distress.

Total difficulties & specific difficulties
In regard to the effects of father absence, a recent British study assessed child problem behaviour on over 15,000 families using the clinical cut-offs of the Strengths and Difficulties Questionnaire (SDQ), controlling for household background such as resources, parental mental health and inter-parental relationship. The study found that father absence (at a given age), similar to poverty and parental psychological distress, predicted a high probability of the child scoring above the cut-off score for total difficulties two years after. Likewise, father absence predicted specific difficulties including borderline personality disorder, severe hyperactivity and abnormal emotional problems. Reciprocally, a child’s severe externalising and social problems (at a point of his/her preschool years) among the many indicators on the questionnaire was also associated with a greater probability of the father being absent two years after. The authors concluded that father absence seemed to be more of a cause than a consequence of child problem behaviour.

Evolutionary approach
Evolutionary life-history theory postulates that women may invest more in their offspring than the opposite gender does due to a slower rate of reproduction in females. Some theorists add that the assured maternal relatedness to one’s offspring may also make women invest more than men do. This is because some men may have variable paternity confidence that the child is his offspring. In light of this, some researchers argue that assured maternal relatedness, together with the lower variance in female reproductive success, may lead parents to bias investment towards female offspring under less favourable household conditions. In other words, father absence and the associated socioeconomic constraints it puts on the household may pose a greater risk to sons’ rather than daughters’ survival.

Psychodynamic approach
The psychodynamic approach posits that behaviour is motivated by basic needs, drives and sometimes shaped by unconscious childhood experiences. It is implicated that for a child to develop a “normal” gender identity, they will have to be raised in a conventional family where there is a father and a mother. Freud believed that being brought up by a single mother could confuse the child’s identity and/or lead them to become homosexual. Father absence may hinder the son’s acquisition of the traditional masculine role, as he is not able to model his own behaviour and attitude on his fathers’. In the same line, sons with absent fathers could have confused gender identities – if the son was separated from his father by age 4, he would be less assertive, less involved in sport, less masculine than other boys and more dependent on his peers. Nevertheless, findings of certain empirical studies on psychosexual gender identification have been deemed contradictory and inconclusive. A number of studies have highlighted such negative consequences of the two-parent heterosexual household on children. Contrarily, some others have pointed out that being reared in lesbian and single parent households where the father was absent did not affect the psychosexual development in children, despite higher aggressiveness and submissiveness, and lower assertiveness.

Biological approach
Genes and hormones may account for the tendency of father absence. Certain DNA patterns have been shown to affect an individual’s degree of fidelity and investment in their offspring. In particular, a study in prairie voles indicates that the gene avpr1a affects the activity of vasopressin receptor in brain regions, and thus predicts less cheating on their partners. Similar to oxytocin, the hormone vasopressin can facilitate trust, empathy and social bonding. Injection of vasopressin in polygamous montane voles significantly increased their likelihood of becoming monogamous. This may in turn decrease their likelihood of being an absent father.

A meta-analysis based on 56 twin and adoption studies totalling over 200,000 families has revealed that genetic makeup significantly affects the individual’s parenting behaviour. Genes in the father predict up to 40 per cent reliably his positive or negative emotions towards his children. In this sense, genes contribute to a father’s liking or repulsion for his children, the latter of which may result in father absence.

Gender difference
There is mixed empirical evidence on the relative impact of father absence on the development of male and female offspring. A recent study in rural Ethiopia, where father absence could mean a significant drop in household income, revealed a considerable difference between the wellbeing of male and female offspring. In particular, the author found that a male infant’s risk of dying (per month) was doubled if the biological father was absent – a 30% greater risk than females. For female infants, father absence (as opposed to presence) was associated with a lower risk of dying, as well as higher nutritional status. That is to say, father absence was only a statistical predictor of infant death for male infants. Such a gender difference has been observed despite a strong cultural preference for sons in the area. On the other hand, in developed countries such as United Kingdom where father absence may not inflict as much harm to the family's income, the impacts of father absence are not noticeably gendered.

Specific examples
Early pubertal timing - precocious puberty - is associated with negative outcomes in both genders. Early maturing girls have been found to be at risk for teenage pregnancy, drinking and weight problems , and giving birth to low birth weight infants. Early maturing boys are at risk for sexual promiscuity and delinquency and testicular and prostate cancer. Individual difference in pubertal timing may be influenced by weight, physical activity and genetics.

Menarche
A central event of female puberty – menarche – is associated with father absence. According to the evolutionary explanation, an unstable home environment (e.g. father absence) discourages a long-term mating life history, leading girls to adopt a short-term reproductive strategy, such as early menarche. This is because they perceive resources they have as scarce and, possibly, their lifespan to be shorter, under the influence of father absence. An early menarche can increase the chance of fertility, while other short-term reproductive strategies can diversify the genes inherited in offspring. These could lift up a higher success rate of rearing children to adolescence.The stress of father absence also prompts girls to develop a variety of internalising disorders, such as bulimia and depression. They may lower the person’s metabolism, causing an excessive weight gain which precipitates early menarche. A study shows that there are fewer monitored meals in the father-absent household. Having meals in the family is arguably more beneficial to children than is eating alone (i.e. solitary eating), as the former lowers the chance of obesity.

However, it has been disputed whether the environmental stress of father absence stimulates weight gain, and thus accelerates early puberty. Likewise, the stress arisen from the absence of mother has been shown to have little influence on the child’s body weight. Since mother absence does not predict weight gain in children, it seems that the increase in the child’s body weight observed is due to the isolated genetic influence of an absent father, rather than the global environmental stress cause by the absence of either parent This is possibly because in ancestral times the survival rate of children with mother being absent was extremely low. A specialised mechanism to deal with mother absence has never been developed.

In addition, recent findings seem to regard genes, rather than the environment, as the mechanism underlying the positive correlation between high body mass index and earlier first menarche onset. Androgen receptor gene may predispose a father to impulsive and externalising behaviours (e.g. family abandonment) and his offspring to early puberty. The essentialness of androgen receptor to female fertility and ovary development has been proven by rodent studies.

Sexual behaviour
Father absence in a household can result in children (of both sexes) having earlier average ages of first sexual intercourse than those raised in father present households. There is also the effect of increased rates of teenage pregnancy. Some evolutionary theories propose that early childhood is vital for encoding information that shapes future reproductive strategies (Belsky, 2007) in regulating physical and motivational pathways of sexual behaviour. Conflicting and stressful parental relationships can lead children to believe that resources are limited, people are untrustworthy, and relationships are opportunistic. As they replicate their parents’ mating-oriented reproductive behaviour, they tend to have multiple sexual partners and erratic relationships. Children implicitly and explicitly model their sexual attitudes and behaviours on their parents, see engagement in non-marital sex as normative. Father absence however can be a byproduct of initial social and economic strain within the household (e.g. violence, lack of educational opportunities and cumulative life exposure to poverty can increase the likelihood of early sexual endeavours and pregnancy). The timing of first intercourse can be heritable - shorter alleles of the X-linked androgen receptor (AR) gene has been associated with aggression, impulsivity, high number of sexual partners, divorce in males and earlier ages of physical maturation in females

Matrilineal support
Despite being poorer overall, widowed and divorced women are on average 2.4kg heavier than women whose children’s fathers are present. Widowed and divorced mothers as well as their daughters are reported to have substantially improved nutritional status which could be explained by them having greater access to the mother’s relatives (matrilateral kin). Furthermore, proximity to a mother’s relatives can dramatically improve female children’s height for age, an indicator of good nutrition. Women who return to their village of birth following marital dissolution are seen to benefit from extra matrilateral kin support, which replaces the help of the missing husband.

Presence of a stepfather
In light of certain research, father absence can be disadvantageous ; certain evidence suggests stepfather presence does not reduce these disadvantages but in fact has a worsening effect to such issues. Ellis and Garber (2000) and Ellis (2004) suggest that stepfather presence is a better predictor of age of menarche than father absence, as it indicates lower quality paternal investment. In accordance with their findings, results show that girls raised in families with stepfathers exhibit a significantly earlier age of menarche than girls raised without stepfathers.

Relative to other groups, children with a constantly absent biological father but a stepfather present reported more frequent incidences of sexual intercourse, as well as an earlier onset of sexual behaviour. The mean age of children with their biological father absent or partially absent is approximately 15. A higher percentage of children with a constantly absent biological father reported having sexual intercourse than those in the partially absent group. Those with a stepfather present and those with a biological father always absent have the earliest first time experiences of sexual intercourse at on average 15.11 years old, whereas children without a stepfather or their biological father partially absent at the age of 15.38 experience their first encounter of sexual intercourse. Interestingly, the effect of having a partially absent biological father with stepfather absence and the effect both stepfather or biological father absence are the same. This study indicated that the presence of a stepfather is not compensating to the disadvantages of a biological father being absent. In some situations, it can cause an even bigger negative effect on children.

No agreement upon effective client treatment
Choice of effective treatment can be greatly varied and thus can be affected by many factors such as age, one’s ability to understand and deal with emotionally heavy material, family members involvement and the family and child’s priorities and needs. In treating some of the negative effects that young girls may have, transference to a male therapist could help facilitate the opportunity to fill any emotional void created through father absence. On the other hand, simply through the existence of a connection with a consistent and empathetic adult can provide some paternal function, regardless of gender.

Conclusion
The evolutionary approach asserts that father absence poses greater survival threat to sons than daughters. The biological approach attributes an individual’s likelihood of him becoming an absent father to his genetic makeup. The psychodynamic approach places much importance to a present father on the child’s psychosexual development, despite generally inconclusive findings.

Father absence causes precocious puberty which increases the risk for teenage pregnancy, drinking, weight problems, sexual promiscuity, delinquency and cancer. Individual differences in pubertal timing may be modulated by both the environmental stress and genes of absent fathers.

Both mothers and children are seen to benefit in improvement through nutritional status and weight gain, seemingly demonstrating matrilateral support as an effective countermeasure against father absence. Stepfather presence however can have various detrimental effects on a child’s development with regards to puberty and menstruation. However seeking effective treatment for certain issues are dependent on various variables such as gender, age and personal needs.