While he was growing up, DH's grandmother (GIL) was one of those meddlers. She had ideas of how things were supposed to be (mostly rearranging furniture in her kids' homes,...). The story that really bugs me, however, has to do with painting.
GMIL believed that basement floors and walls should be painted. Yes, even unfinished basements! (And when the paint wore out on the floor, it needed to be reprinted. Who goes this?) Anyway, MIL and FIL purchased a new home and GIL was visiting to help out shortly afterwards. GIL said the basement walls needed to be painted, but FIL didn't want to. So what did she do? She rolled paint once or twice on each wall and stopped, knowing FIL would would be compelled to finish the job.
No, FIL did not have a good relationship with his MIL. How'd you guess?