This sort of happened with two of my cousins -- when the older one turned 18, my aunt and uncle started charging her rent to continue living with them while she went to school. I'm not sure exactly what happened, but she ended up dropping out and getting married within a couple of years and has gone LC with them ever since. They did the same with the younger one, and she got all of the rent money back when she graduated and moved out. Now the older sister is pissed because they didn't do anything like that for her, and my uncle is insisting to everyone that it's "Trump derangement syndrome." He also thought it would be funny to use her Amazon account to buy a MAGA hat for her with her own credit card