Can a 20 Year Old Daughter Still Be a Teenager?
Boyfriend aside, she’s 20. She’ll support herself if she has to. I’d let her move in with them (cant’ stop her), withdraw all support, and lovingly tell her I think she’s better than that and she’s wasting her youth in some ways by limiting herself to a home life with someone’s parents AND a boyfriend who she may or may not start a life with.