Every other post in this series is about money – the build, the benefits, the rent, the credits. This one is about the part that no spreadsheet will save you from. You can get every dollar right and still end up with a household nobody can stand to live in, a marriage under strain, and a parent who feels like a boarder in their child’s home. The money is the easy half. This is the hard half.

The good news is that you’re not attempting something strange or fringe. Multigenerational living is the fastest-growing household type in the country, and doing it well is a solved problem – as long as you treat it like the serious, multi-year arrangement it is, and not something that will “just work itself out.” The families who thrive are the ones who had the uncomfortable conversations before anyone moved a box. The ones who suffer are the ones who assumed good intentions would be enough.

Somewhere in the process of moving a parent in, almost everyone assumes there’s a tax credit waiting for them. “They’re living with me, I’m supporting them, surely the government gives me something for that.” It’s a fair assumption. It’s also wrong more often than it’s right — and the reason why is a distinction most people never hear until they’re denied.

The short version: elderly is not the same as infirm, and the marquee credit hinges entirely on the second word. But there are other doors, some of them more valuable and more overlooked than the one everybody reaches for first. This post walks all of them, straight, with the pros and cons named rather than buried.