AbstractThis study aimed to examine the processes of intergenerational transmission of attitudes toward migrant integration policies in families with adolescents. Participants included 809 adolescents (Mage = 15.61, range: 13.87–20.04 years), 545 fathers (Mage = 51.19, range: 38–77 years), and 716 mothers (Mage = 48.11, range: 33–68 years) involved in a longitudinal study with two assessments and a time‐lag of 1 year between them. Each family member completed the Attitudes towards Migrant Integration Policies scale. In addition, adolescents reported their perception of discussion of current events with parents and the level of support they receive from them. The cross‐lagged model highlighted a unidirectional transmission, with fathers' but not mothers' attitudes toward migrant integration policies influencing adolescents' attitudes. Furthermore, it has been examined which factors can either amplify or reduce the strength of intergenerational transmission processes considering individual characteristics of both adolescents (i.e., sex, age) and their parents (i.e., political orientation), and cultural (i.e., family, ethnic background) and relational (i.e., discussion of current events, perceived support from fathers and mothers) family characteristics. Individual factors (i.e., fathers' political orientation) and family relational characteristics (i.e., perceived support from fathers) moderated the transmission processes. The transmission was bidirectional when fathers reported being left‐wing and politically oriented and stronger when adolescents reported high support from their fathers. Thus, this study underscores the complexity of the family context, highlighting that the transmission of inclusive attitudes does not always operate in one way (e.g., from parents to children) or another, but in some cases, simultaneously.