I see your point about the single Mom’s. We are an intact family, but we are in process of building a modest home around us, it is unfinished as we live in it, and my husband works but has some health issues and so my son’s are helping with that as well. I’m having difficulty finding a job right now, hence the working together to keep this ship sailing.
I have known single women who just aren't in a hurry for the kids to leave. As long as it mutually beneficial.
I know there has been talk of the boomers moving back in with their parents. Mostly this is due to health considerations. We almost had to move in with my MIL. Thanks be, it was decided that she could afford assisted living. She is 89. But not everyone can. It's about 40,000-50,000 a year to live in one of those places.