I have been analysing for years thousands of lists of significant family members given by a variety of respondents, from college students to senior citizens, from individuals in long lasting married couples to individuals in stepfamily households, from pregnant women at risk of putting their child into custody, to young adults from foster families, in Switzerland or elsewhere. Those lists made it possible to reconsider the issue of family diversity without referring priorly to family structures but to a variety of processes of family inclusiveness or exclusiveness that have their own relational logics. My presentation will describe such logics and stress their social roots, while acknowledging their ordinary and extraordinary nature.