I have a friend who I'm just getting to know - kids off on school hols so she brought her DD with her one day and I'd left mine at home. I brought DD3 the next day because she is same age as her DD. They got on nicely and played well that day and next but today they've played nicely but friend's DS is back home and he wouldn't leave his sister and my DD alone. He had a friend with him and they just kept tormenting them so DD came home with my friend's DD and they played nicely. Next thing I know my friend's DS and his friend are knocking on the door saying that the girls had to go to the park so his sister was nearer to home because it was getting dark. I thought ok and let them go. Text friend to say they were on the way and she text back that her DS was just jealous her DD had a friend round so I took this to mean that she hadn't actually requested her DD go play in the park. Now my DD has come home in tears saying how horrible my friend's DS is - how it was all a lie to get them out and how he was trying to hurt his sister and she was trying to protect her and then every time they tried to get away he and his friend were following, calling them names etc. Now she is home crying and I don't know what to do - should I tell friend her son was being a little shit or should I leave it? I am hoping that her DD says something but if her DD is used to this behaviour by her older vrother, then maybe she won't say anything. Don't want to upset friendship before it's really begun.