Keke Palmer showed Architectural Digest her house and called it “Full House — except instead of three uncles, we’ve got three aunts.” TikTok is full of sisters touring homes they bought together; one Toronto pair has exactly one house rule, “No boys,” with boyfriends required to keep their own place. Kelly Marie Coyne’s New Yorker piece reads the trend against two numbers moving in opposite directions: housing costs up, marriage rates down.

The figures are stark:

  • 22% of Gen Z homeowners bought their home with siblings in 2025 — up from 12% in 2024 and 4% in 2023 (Bank of America survey).
  • 87% of U.S. adults say buying a home is harder for them than it was for their parents (Pew, July).
  • The U.S. marriage rate hit an all-time low in 2019; as of 2021, a quarter of forty-year-olds had never married.
  • Intergenerational living is rising too, and it is most common in places with large Latino, Asian and Black populations — which makes the “new” household the historic norm for much of the country.

The historian Steven Mintz supplies the part that reframes everything. In early America, unmarried women typically stayed in the parental home, moved in with a married sibling, or built a household with unmarried sisters. “Sibling co-residence solved practical problems: housing, respectability, care, inheritance, disability, widowhood, poverty, and old age,” he writes. “Before robust welfare states, pensions, nursing homes, and women’s broad access to paid work, siblings were a crucial safety net.”

Mintz’s sharpest line is about the “spinster sister”: “she was not merely a stereotype. She was produced by a society that exalted marriage but did not provide all women with viable marriages or independent livelihoods.” The bounded nuclear family came later — suburbs, “family togetherness,” the Baby Boom, and a mortgage-shaped American Dream in which children stay only until they can buy their own. Television mostly explained adults sharing a house through divorce or tragedy, though Hocus Pocus, Kate & Allie and The Golden Girls turned shared woman-run households into a source of power rather than a failure.

Coyne’s cases are ordinary and specific: Mindy and Kayla in New England, splitting expenses 60/40 with household meetings and a couch purchase that caused “a little backlash”; the Zetterquist sisters, who folded Erica’s boyfriend into the 2023 house and kept the arrangement after the engagement; the McGoverns of South Boston, matching peony-and-heart tattoos two nights before one moved out.

The trend is being filed as affordability, and it is that. But the history says something more uncomfortable: the one-married-couple household is the twentieth-century exception, and what we are watching is a reversion to the form people used when there was no welfare state, no pension, and no well-paid work available to women. Cheaper housing would help. So would policy that stops assuming a household means a married couple — and treats care, disability and old age as public business rather than the private residue that siblings are expected to absorb.