My mum always takes something every time she visits (very rarely).
We started noticing random things missing, like a lettuce, half a pack of carrots, an open pack of Philadelphia etc.
I once asked her if she had noticed a lettuce in the fridge as I was sure I had one, she said I must have used it and forgotten about it.
So we did what we’re not supposed to do, put up a camera for her next visit, and there it is, constantly stealing something random every single time.
We still keep the camera in the kitchen without telling anyone, as turns out the stealing is the least incriminating thing she gets up to in our home.
Wish I could cut contact, but then I would lose my dad and siblings as well, which I can’t bear…