Interesting point. I remember a GF whose parents simply would not let go of her. I did not mind the company at my house, as I love to cook, but they hoovered and were a pain in the ass. Every goddamn decision the GF parents wanted to know about and make their comments. The parents one evening actually took my car without my permission I did not know that and called the cops. I found out they were mad over some nonsense, who knows what it was maybe I farted in mixed company or some equally inane crap.
I knew the relationship was headed the way of the Titanic and I was fed up. So I knew the father was a Frank Sinatra fanatic and liked to sing "My Way" the only problem was the man sang through his nose. I practiced "My Way" and with a booming tenor voice and right intonation I proceeded to perform one night with my guitar and the mother loved it, the rest of her family loved it and the father stormed off to his room I heard banging....LOL Shortly thereafter, the relationship ended and I breathed easy.
I learned a lot about pain in the ass future in laws and what to watch out for and what not to become. BTW the GF was in her 30's