Whenever I go to MILs, my DHs half brothers kid always jumps on me, kicks me, punches me (once in the face and a few times in the stomach) and they do nothing about it. When he does it to Dhs half brother, he just swings him around, holds him down on the floor laughing etc. and they tell me "oh, just hit him back" but I can't. But at the same time, I have this kid really actually hurting me, he even kicked 19 month old DS in the back. How do I deal with it?