An interesting intersection between housing issues and health care, I know a couple who is currently looking at buying a duplex. One half for them is to live in, the other half is to rent to one of their parents. It addresses not only the issue of affordable housing, but also gives the couple an opportunity to care for the parents as they start to age. It seems like they're not the only ones with similar ideas. If you google "multi-generational housing" you'll get a lot of hits from various sources and perspectives.