The claim is well supported in the social-science literature: a 2011 Annual Review states that children learn moral values and social conventions through socialization, much of which involves parenting, and that these processes interact with socio-cultural factors. A later review also says children learn social norms through parent-child interactions and then internalize them, which supports the idea that upbringing shapes what people come to see as acceptable social behavior, even if it does not fully determine it. (annualreviews.org) Sources: Annual Review of Psychology, "Socialization Processes in the Family: Social and Emotional Development"; Frontiers in Psychology, "How we learn social norms: a three-stage model for social norm learning."