Almost every time the IL's visit, they end up taking something from our house home with them. The younger siblings have accidentally taken a couple of our pillows/towels home, and FIL sometimes gets overeager loading the car and throws some of our stuff in there (my purse once, an umbrella some other time, sleeping bags, blankets). Understandable stuff.
But MIL is special. When she came for the wedding, she went home with our nice salt and pepper grinders. When she got home, she said, she realized the mistake but liked them so much she just kept using them. She "replaced them" with a pair of disposable ones.
She has also gone home with an heirloom cast iron frying pan (it's most notable user being my grandma, who smacked my uncle upside the head with it when she found out he had hit a girlfriend). I had to explain that "replacing it" wasn't an option, but she still didn't return it voluntarily, and we snuck it back the next time we visited.
There have been other instances (some of H's clothes, a picture album) and this last weekend it was our clothes iron.
At what point do I stop treating it as repeated accidents? As long as I can get irreplaceable things back, I don't feel like I need to confront her. H wants to say something, but even if HE has the convo with her, I'M the one she's going to take it out on. Would y'all say anything?