I've written down heaps of things that both my mother and MIL do that annoys the crap out of me so when my kids are older I can remind myself not to do them.
The other day I was lining up in a shop to pay for something and in front of me were two older women, both grandmas. (Say 60 or so). One of them was bitching about the daughter in law saying that everytime she calls and asks to see the grandkids there's this whole song and dance and she has to schedule it in and make a really big deal out of it etc. She didn't say it as nice as I'm writing it though, her tone was really angry. The other woman said, oh yes it's so hard for people once they have children to fit everything in, get kids to after school activities etc. She was totally sticking up for the parents and not letting her friends bitching and moaning go anywhere. When they turned to look at me one had a lovely relaxed face, aging but well. The other looked haggard and mean, deep lines all over her face, what I call 'angry woman lines', angry from all the scowling and complaining she's down over her lifetime! You can guess which face belonged to which woman.
So the moral of the story is don't turn out to be the bitchy mum or MIL or not only will your kids hate having you over but you'll end up ugly!