I’ve really pulled back from some friends with 5 kids who just seem to let the kids run wild. They are pretty agressive, and after the one who is 6 months older than my 2 year old daughter whacked her twice on the head without provocation, and the parents didn’t really intervene, I removed my kid and haven’t gotten together again. I draw the line permissive parents who allow violence. I also find myself being much more authoritative with their kids if we’re playing together and the parents don’t say anything when the kids are mean or dangerous. I’d rather overstep my bounds than have a kid get hurt (especially mine).