LW1: Ugh, this is a tough one. Feral children who are not brought up with any sense of courtesy or manners is endemic, sadly, and the parents are to blame. That said, you can't tell other people how to raise their kids, not even your own kids. You can, however, explain to your daughter that you find it hard to spend time with her son, and why. Be prepared for her to get upset if you do this; however you might be doing the kid a favor.