Replication Data for: Resemblance reporting on children; sisters are more proactive than brothers

These data relates to the article \"Resemblance Reporting on Children: Sisters Are More Proactive than Brothers\"
Abstract: The asymmetric grandparental investment in humans can ultimately be explained by the paternity uncertainty hypothesis. The proximate mechanisms leading to grandparental bias in investment in grandchildren is however not clear. In a study of 233 males and females with an opposite sexed sibling, we examined whether the frequency of comments on child resemblance changed when both siblings became parents, compared to when only one of them had children. We found that comments among siblings on resemblance of children occurred more frequently after both siblings had become parents, compared to when only one of them had children, suggesting that resemblance description may become more important after both siblings get children. More important, and in line with the recent suggestion that mothers may mentally exploit the alloparenting environment by expressing biased resemblance descriptions, males reported that their sisters commented on resemblance more often and more intense, concerning their own child, compared to what females reported about their brother’s child. Additionally, females self-reported that they were the most proactive during resemblance descriptions. Thus, sisters might, through more frequent voicing of stronger opinions on parent-child resemblance than their brothers, influence alloparents’ perception of resemblance to their children and thus influence alloparental investments.