Despite the decline in prejudice towards LGBT people, the issue of parenthood is still controversial with negative attitudes towards LGBT parents being openly expressed. This study aimed to examine attitudes towards parenting by same-sex couples using a vignette design. Parenting condition (parent's negative vs positive reaction), active parent's gender (mother vs father) and family composition (different-sex vs same-sex couple) were varied to test differences in the evaluations of parenting, child behaviour, family environment, social distance and willingness to grant rights. 392 heterosexual and cisgender students from the University of Zagreb (87% female, 13% male), aged 18 to 37, participated in an online study. After reading one of the eight vignettes, participants evaluated parenting, child behaviour, family environment, social distance and rights of the family described in the vignette. The results showed that parenting and family environment were evaluated as better, and participants were less convinced that the child's behaviour is the result of parents' relationship in the positive parenting condition than in the negative. Social distance was lower towards parents in the positive parenting condition than in the negative and-unexpectedly-towards same-sex in comparison to different-sex couples. Participants were more inclined to grant family rights to parents from the positive than to those from the negative parenting condition. Although other results suggested unbiased attitudes towards same-sex couples' parenting, participants were less inclined to grant same-sex couples family rights in comparison to different-254 Revija za sociologiju | Croatian Sociological Review 49 (2019), 2: 253-281 sex couples. The findings reflect an important mechanism underlying the stability of prejudice-a resistance towards generalising attitudes from individual cases to a group. This can be used in efforts to confront prejudice against parenting among LGBT people.