And after the bonding infancy and toddler stages for developmental purposes of course but one reason why the nuclear family is so strongly inscribed into post modern era politics is the degree of alienation and individualization people feel in contemporary society. For many people, in the ruins of all social institutions, the family is the place of community and sanctuary (unfortunately also the place of great suffering in many cases) from capitalism today, hence the nuclear families persistence. But that is also a reflection of the lack of counter hegemonic forces in society that could changes possible. Abolition of the nuclear family is fine but from our current material circumstances is unlikely and ultimately unacceptable to the majority of people only through long term historical processes largely outside of our control could even make possible (climate change, world war, mass scale human migrations, disease, bio tech terrorism etc.)