Most kids drive me crazy - especially ones that come from homes with a lack of discipline...however, that is YOUR home and the neighbors should understand that and not take it personally when you set up rules for your house. I tell the neighborhood kids that only one friend per child is allowed in the house if my husband is not home. Sometimes I don't even let the one in unless he is there - that is added stress on me, and not necessary - whatever happened to playing outside? So, when I do allow kids inside, I put a limit on it - one girl has multiple brothers and sisters and they younger and would just walk into my house without permission! So, I put a stop to that and told them only 1 at a time...it's not your job to babysit the whole neighborhood. So - in your case, I would say that they are more than welcome in your house, but they have to take turns and work it out before they get there, so only one of them is there at any one time. You should not feel guilty about this; you have tried to speak with the mom about it and she blew it off, but you don't have to put up with the bad behavior. You also tried sending them home, but as a mom, you know nothing stands between sibling rivalry! :)