My brother has announced they he's coming this weekend with his wife and kids. The girl is 7 and the boy is turning 3. I have a good size n-scale loyout I'm trying to protect. Today I installed a door on the train room that will be locked most of the time while they're here, but the 2nd bathroom is off the train room. I need suggestion for protecting my stuff if/when they get in there, ways to convice them that a $150 Kato is not a toy without starting a major clash. The girl has nothing to do with me, won't speak to me and that last time I tried taking a photo started wildly kicking at me, the bruses lasted a week. The boy likes to throw and bang stuff. HELP!