This isn't a TAAT, but inspired by a spate of recent threads with depressing attitudes from other posters, whose PILS aren't welcome even for an hour on Christmas Day, or to stay overnight just once for their DGC's birthday- what nice things have your PILs done?
We have DC1 on the way, and MIL kept all of DH's children's books from when he was little, plus added all the best new ones for us so that the baby will hopefully love books as much as I do.
I am sure I'm not the only one with a nice MIL, even if she is a bit bonkers sometimes!