My mother in law does a Jack Skellington I will drink coffee here or there I will drink coffee everywhere tshirt. She buys food we don’t need and often used to send us home with a car load of groceries we often didn’t like. I’ve just been frank and respectful. Mom, please check with me before buying 3 giant hampers. I have a system that works and it messes with my system. With my MIL for years we just took the food home, ate what we wanted as best we could. My husband told his mom as politely as he could that the food would get wasted if she went overboard. I’ve had to be more firm with my mom. I let her see that I am decluttering and that some of her gifts will be given away. I gently explain that my children don’t need 3 sleeping bags each.