I need some advice to handle this age appropriately. DD10 is friends with a boy,S, who is 8 who lives around the corner. She also hangs out with a girl, A, who is 9. They like to come to play at my house all the time. A stopped coming around as often. The times she did come over, if S showed up, she'd leave. A came over yesterday and I asked her about it. She said S was mean. I had noticed before he has issues with boundaries (when he's told no, he does what he wants anyway. disrespects my rules, swears a lot). Today he came over to play with DD. He left a short while later. DD told me she doesn't want to be friends with him anymore and is afraid to tell him because he's mean to her. She wants me to tell him when he comes over tomorrow. How do I gently tell a kid that my kid doesn't want to be friends? I don't want to say anything to make his mother get upset and confront me.