Living in a family members home with our belongings

My husband and I lived with his mom the last 5 years, 2 of which she wasn't living there and took a job in another state and we were left in charge of the home. She recently passed away and we moved out, now his family is accusing us of taking things that we didn't own, when we simply took what belonged to us and left her things alone for the probate process. They are threatening to have the cops come after us even when we have proof of ownership as in paid receipts of what belongs to us, high value wise like lawn mowers, pressure washer, furniture and televisions