1st one I asked the parents but ... it was more of a formality than permission, their daughter was getting what she wanted no matter what they said ... that should have been a hint of what was going to happen 9 years down the road.
The next one ... I'm in the opposite position, the mom keeps dropping notes every so often. Too bad the mom has her stuff better than the daughter, which is why I'm dragging this one out.
I don't see much wrong with at least partaking in some form of formality in regards to the in-laws since they are the ones who will make your life easier or harder. If you hit it off with them and figure out them out before hand you will have a better view of what is coming down the road.
I also prefer the type of parent that believes that their little daughter needs to take of herself rather than running home when ever there is a problem.