And? What next? They want his first born because they paid for their son’s medical bills?
Ummm…no. Do you realize what you just said is also true for your mother? And if your dadi did that to your mom, you would have a big issue watching your mother scrounge and ASK for money to do basic things like get a haircut or buy herself a candy bar. Is that fair? No. After marriage, your independance is everything…there is NO room in my opinion for a third party to butt in and tell anyone what to do and how to do it. No room at all.
What if your wife started seeing your parents as a waste of money too? It goes both ways.