You watch them spending too much money on things they couldn’t afford if they were paying rent like they’re supposed to but aren’t because you’re still trying to figure out: A) How temporary is this? B) Do I want to be my kid’s landlord? C) Am I lucky my kids love me enough to move home? D) Am I a sucker?
If you are an adult living with your parents right now (I was up until about ten seconds ago, it’s cool) you should send them this essay by Jim Sollisch. Put a smiley face in the subject line (or, print it out and draw the smiley face). It’s short and sweet and a little bit funny and ends on a high note. It also comes out squarely in favor of adult kids not paying rent (bonus).