The Cinderella effect is a term used by psychologists to describe the high incidence of stepchildren being physically abused, sexually abused, neglected or murdered, or otherwise mistreated at the hands of their stepparents at significantly higher rates than their genetic counterparts. It takes its name from the fairytale character Cinderella, who in the story was cruelly mistreated by her stepmother and stepsisters.

Research

In the early 1970s, a theory arose on the connection between stepparents and child maltreatment. "In 1973, forensic psychiatrist P. D. Scott had summarized information on a sample of 'fatal battered-baby cases’ perpetrated in anger (…) fifteen of the twenty-nine killers – fifty-two per cent – were stepfathers." Although initially there was no analysis of this raw data, empirical evidence has since been collected on what is now called the Cinderella effect through official records, reports and census.

* Years of research have confirmed the hypothesis that stepchildren are significantly more likely to be abused in terms "from baby batterings (sic) to sexual molestation of older children" to murder.

* Studies have concluded that "stepchildren in Canada, Great Britain, and the United States indeed incur greatly elevated risk of child maltreatment of various sorts, especially lethal beatings".

* For over 30 years, data has been collected regarding the validity of the Cinderella effect with all the evidence proving a direct relationship between step-relationships and abuse. All such evidence on child abuse and homicide "is derived entirely from official reports of child abuse or from clinical data."

* In Chicago, police homicide records show that "115 children under 5 years of age were killed by their putative fathers in 1965 through 1990, while 63 were killed by stepfathers (…) and because very few babies reside with substitute fathers, the numbers imply greatly elevated risk to such children."

* The most powerful evidence in support of the Cinderella effect is the proof that when abusive parents have both step and genetic children, they generally spare their own children. In such families, stepchildren were exclusively targeted 9 out of 10 times in one study and in 19 of 22 in another.

* This discrimination towards stepchildren is unusual due to "the following additional facts: (1) when child abuse is detected, it is often found that all the children in the home have been victimized; and (2) stepchildren are almost always the eldest children in the home whereas the general (…) tendency in families of uniform parentage is for the youngest to be most frequent victims." The Cinderella effect explains this discrimination of abuse among stepchildren.


Explanations

The Cinderella effect may be best explained through evolutionary psychology. Its origin and evolution into the role of human behavior is a direct effect of the Darwinian theory of natural selection as explained by Daly and Wilson.

According to theory, "research concerning animal social behaviour provide a rationale for expecting parents to be discriminative in their care and affection, and more specifically, to discriminate in favour of their own young".Natural selection measures an organisms success by its reproductive ability, explaining why parents invest their resources in their genetic children.

This evolved rationale is why parents have developed the desire to protect their own young for investment in their own fitness and to ensure "genetic posterity (inclusive fitness)".

As an evolved species, humans follow "the assumption that any evolutionarily successful organism must balance its allocation of time, energy, risk, and other resources to itself-its own growth and maintenance." Therefore, in the position of step parent, one cannot be expected to care for their non-genetic children out of altruism because they are earning no reproductive benefits.

One would therefore expect greater parental responsiveness towards one's own offspring than towards unrelated children, and this will result in more positive outcomes and fewer negative outcomes towards one's own children than towards other children that one is expected to invest in (i.e. stepchildren). "If child abuse is a behavioral response influenced by natural selection, then it is more likely to occur when there are reduced inclusive fitness payoffs owing to uncertain or low relatedness."

Due to these adaptations from natural selection, child abuse is more likely to be committed by step-parents than genetic parents - both are expected to invest heavily in the children, but genetic parents will have greater child-specific parental love that promotes positive caretaking and inhibits maltreatment.

It is sometimes argued that this evolutionary psychological account does not explain why the majority of step-parents don't abuse their partners' children, or why a significant minority of genetic parents do abuse their own offspring.

However, their argument is based on a misunderstanding: the evolutionary psychological account is that (all else equal) parents will love their own children more than other people's children - it does not argue that step-parents will "want" to abuse their partner's children, or that genetic parenthood is absolute proof against abuse.

Under this account, step-parental care is seen as "mating effort" towards the genetic parent, such that most interactions between step-parent and stepchildren will be generally positive or at least neutral, just usually not as positive as interactions between the genetic parent and the child would be.

Source : www.wikipedia.org