My mother-in-law is absolutely beside herself that my adult kids still live at home (age 20 and 23) and that my 27-year-old niece still lives with her parents too (my husband's sister.)

She doesn't understand the fact that neither my husband or his sister actually mind their kids living with them into adulthood. It actually shares the household burdens and we treat them with respect, which is reciprocated.

With the cost of housing, my kids may live at home for several more years, and I'm more than fine with that.