The stuff Cuba just added to their constitution is a good modern take on it. The radical creches that were common in the early Soviet Union were also an interesting system, although they did evolve into more conventional (albeit world class) kindergartens as the country industrialized. Overall I think the "bourgeois family" is mostly about property relations and inheritance, which communists of any stripe should have a problem with, and abolishing it and replacing it with a living system of relations which includes not only adding more people to your "family", but also giving everyone the ability to leave their "family" for any reason. A socialist family shouldn't just be your blood relatives, but also the people in your village, on your street, or in your apartment block. Admittedly this is hard to comprehend from our position within a capitalist structure which not only levers every household apart from its neighbors but drives a constant wedge in between individual household members as well in its drive to atomize every one of us, but in a society that is organized around building solidarity instead of driving competition I think it would come much more naturally to include a wider selection of people in your family.