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Three Generations, One Roof: The Quiet Comeback of the Full House

by LaTasha McDowell

This week's spotlight: Phoenix, Arizona — where casitas and guest suites went from luxury to lifeline.

Grandma isn't visiting anymore. She's moving in. And honestly? It might be the smartest financial and emotional decision your family makes this decade.

Multigenerational living is one of the fastest-growing segments of American home buying. According to the National Association of Realtors, a record share of recent buyers purchased a multigenerational home — driven by caregiving for aging parents, adult children boomeranging home, and families pooling incomes to afford more house together.

That last part deserves a spotlight: pooling incomes. Two households merging into one isn't just about togetherness — it's math. One mortgage instead of a mortgage plus assisted living. One utility bill instead of two. Built-in childcare that doesn't cost $1,400 a month per kid.

WHY PHOENIX GETS IT

Phoenix builders saw this coming years ago. The casita — a separate small guest house or attached suite with its own entrance — is practically a signature of Arizona living. National builders now offer "home within a home" floor plans there, with private entrances, kitchenettes, and en-suite baths designed for parents or adult kids. When a metro's new construction leans into a trend that hard, it's not a fad. It's a shift.

THE HONEST PART

Living with your parents — or your adult kids — is not a Hallmark movie. Boundaries get tested. Kitchens get crowded. And the legal and financial side is real: whose name is on the deed? What happens to the house when one generation passes? Skipping those conversations is how families end up in courtrooms instead of family rooms.

There's also a resale question. A home with a true second suite is increasingly valuable — but a badly converted garage is not. The difference matters when it's time to sell.

HOW TO DO IT RIGHT

First, buy for privacy, not just square footage. Two primary suites on opposite ends of the house beat five bedrooms in a row. Separate entrances are gold. A kitchenette turns tension into peace.

Second, put everything in writing. Who pays what, who owns what, what happens if someone needs to move out or passes away. An hour with an estate attorney now saves years of family conflict later.

Third, think about the third chapter. That casita that houses Mom today can become rental income, a home office, or a returning college kid's landing pad tomorrow. Flexible space is the best insurance a floor plan can offer.

THE BOTTOM LINE

The "full house" isn't a step backward. For millions of families it's the upgrade — financially, practically, and emotionally. The families doing it well aren't the ones with the biggest houses. They're the ones who planned for privacy, put the money talk on paper, and chose a layout that lets everyone breathe.

Thinking about combining households? Start the conversation at your own kitchen table first. Then let's find the floor plan that keeps the peace.