New structures for family-friends?

Chatting with a friend recently and came up with this novel idea.

Historically, many people would end up married, having kids, and having responsibilities to their family and local community and groups.

These days, we have less family and civic integrity, less people are having kids. More people are creating their family of choice with friends.

I think there’s a general love and aliveness everyone wants to express and be in connection with.

But without the usual routes of kids/religion/local community, it doesn’t get routed well anymore.

We need more structures/ideas/understanding to support new kinds of families and community structures.

Examples:
How about an app that makes it easier to crowd source among trusted local friends to babysit?

Most housing is built around one nuclear family 1-4 bedrooms. But what about community homes with larger kitchens and living rooms and smaller but more bedrooms?

I’m gesturing at this general area at the idea that modern, industrial civilization is built around nuclear families but we have a lot more forms being generated now but still lagging behind in the idea/social practice/phys infrastructure to match.