L.R.
We had this issues with my son's uncle. They are only one year apart (strange story, but true-yes, my husband has a little brother the same age as his son! lol). Every time he & the other kids would come over, they would break things, drag things out & not clean up after themselves, etc. The parents were not saying anything to them, so I decided that since it was my house, I should speak up. I started correcting the kids when they came here; telling them that they were not allowed to play in my son's room. They could go play outside or play with the toys in front of the adults. Yes, it wasn't the most comfortable or nicest way to do it, but the bad behaviors stopped. Once those kids learned that in my house, they will follow MY rules, things changed.