Many studies on family solidarity emphasize the importance of norms for understanding why people help family members. The question of where kinship norms come from, however, is underanalyzed. This study examines the influence of the family of origin on the development of kinship norms using models of sibling resemblance estimated on a large-scale multi-actor survey. Analyses show that a quarter of the variance in filial norms can be explained by the family of origin. The family of origin has a smaller influence on normative obligations toward children and other family. Part of the total family influence can be explained by the filial norms that parents have themselves and the emphasis parents put on obedience. Family background characteristics are less important. © 2008 Elsevier Inc. All rights reserved.