We used a person‐oriented approach to describe the profiles of Mexican American emerging adults' relationships with siblings using affective/behavioral qualities (e.g., positivity) and relationship maintenance strategies (e.g., communication frequency) and to examine how profiles of sibling relationships were related to dimensions of Mexican American emerging adults' familism values. Using data from 186 Mexican American emerging adults (Mage = 21.56), we conducted latent profile analyses and identified three profiles of emerging adults' relationships with siblings: moderate (n = 106), positive/involved (n = 64), and negative/distant (n = 16). Our findings suggest that the majority of emerging adults in our study reported close relationships with siblings and dimensions of familism values were differentially associated with profiles of sibling relationship qualities.