I too had in-law problems. My ex-wife's mother was not too fond of me. Actually, she didn't like anything about me, including how I dressed. Most of all she hated, I mean hated, a pair of surfing shorts I had. They were colorful but not too loud, mostly shades of red and yellow. Well, on my ex's and my second Christmas together, I got a present just from her mother. It was a pair of short she sewed as a joke just for me. The most awful gaudy floral pattern you have ever seen. No tailoring, a quick stitch up the sides and crotch. With the draw string, looked like a bag. She laughed and laughed at my expense in front of the whole family. That was the last time she ever laughed in my presence. From then on, every time they would come to visit (they were from NY, we were in CO), I would wear those shorts. Wearing them at the Christmas dinner table with my J Geils Love Stinks t-shirt would send her into orbit. It would also shut her up for the entire meal. Revenge is best served with a big 'Kiss my ass'.
Does that beat a dusty Tupperware bowl?
Edit: Found them: