Sounds like my former in-laws. Their children have on different occasions ground chocolate cake in the carpet, mangled the mini blinds, set a tablecloth on fire (with candles), thrown my dog in the pool (in November) broken the front window and dismantled my porch swing (I mean removed the slats) without an tools. I made them reassemble it before they ate Thanksgiving dinner. Their parents are teachers and don't believe in "thwarting their creativity" Now you know why they were only invited to our house once per year. And we put anything breakable in the attic with a lock.