Hello, I am new to the forum so please bear with me. I have a 4yo boy and a 4+1/2 yo nephew who is just one of many nieces and nephews in age range from 2-7. Everyone plays well and gets along together except for one little nephew, the 4+1/2 year old. The child is mean and often roughs up others, sometimes with a sudden unexpected violent act. Example: grabbing a cousin by the legs and pulling him off a bench and onto a hard landing on top of a toy on the floor. That caused pain + tears but fortunately no injury. Well now this little nephew has attacked my son and he has done the same thing to him 2x. I don't know what to make of this. I always watch them carefully when the interact. I watch my son at all times no matter which child he is playing with! But both times, miraculously, it happened as I was at a distance and I looked away. Incident 1: While Jumping on the trampoline, my son suddenly went face down, crying, screaming and rolling on the ground. He was inconsolable for about 10 minutes (not normal for him). He refused to tell anyone what hurt. Later on, my husband and I coaxed the details from our son. He said the 4+1/2 yo cousin kicked him. When asked where, he pointed to his privates. That might have been accidental, but maybe not. After it happened, the cousin did not apologize or seem concerned in the slightest. He went about us business. Now, the same exact situation occurred again !!! the very next time they were playing together. Again, no one saw how my son got hurt but the same little cousin was right there, and he did not try to help, and he did not ask what's the matter. And again, my son said (later) he was kicked in the privates, this time from behind. Here is my question: can a pre-school kid be THAT sneaky and deliberate? I've seen the 4+1/2 yo boy be snotty, out of hand and out of control before, ... but if what my son tells me is true, then this rises to a new level of vindictiveness, like a sucker punch. Any comment? Can a pre-school kid be so nasty? I apologize in advance if I seem to be bad-mouthing my relatives, but I am trying to understand. Thank you.