Abstract
This study did not replicate a 1981 finding by Burker, et al. that opposite-sex siblings have a positive effect on women's opposite-sex friendships and a negative effect on men's opposite-sex friendships; extrapolation of their finding to romantic relationships was also not supported. The present study also investigated effects of sex-of-sibling on same-sex friendships; data for 71 women and 49 men ( M age = 18.8 yr.) showed that effects of sex-of-sibling were not specific to friendships with members of one sex. Finally, while Burker, et al.'s results are consistent with a process of sibling deidentification, the current study, in suggesting a positive effect of sisters on same-sex friendships, is consistent with a process of sibling identification.
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