I'd like to see an adult child hold a grudge and use the "my house, my rules" tactic against visiting parents.

"Dad, I appreciate you and Mom coming to visit all the way from Houston. But you weren't home by 10:30 as per the rules of this house, which I paid for. You're grounded for two days. I've taken your car keys. Also, Mom, if you want to live under this roof, even for a week, you'll stop using that Lady Grecian formula. No mother of mine is going out looking like a blonde harlot. And I don't care if your other 64-year-old friends are doing it."