Beat my sons A$$!!!

So my son is 7 years old. I have 3 kids 7, 4 and 1 years old it goes boy, girl, boy! For some reason lately my oldest has been acting really nasty towards my daughter for no reason. Like throwing her toys, messing up her blocks, pushing her round etc and I have told him multiple times to leave her alone and he doesn’t listen so I take his things away, ground him and other things but it doesn’t work.

Yesterday while she was standing in my room he just walked up and slapped her in the face for no reason. We don’t hit, I feel if I do, it is out of anger not for discipline, I don’t spank my kids that often (like maybe 3 times in the last 7 years) anyways Today was the last straw they were playing in the living room and my oldest grabs his sister favorite doll and slams it on the ground breaking the leg off making it unfixable I got so pissed I yelled at him, and went after him but I stopped because I felt if I did anything I would be doing it out of anger.

So I stopped and took a breath, told him he needed to go to his room and sit. I talked to my daughter and told her we will get her a new one, then I went into his room and told him he no longer gets his ps4, gaming chair, or YouTube till he starts acting right. I expressed how he is being a bully and he knows I don’t like bullies; I asked him why he is being a jerk and he said “it’s just what brother do”, I said “no it’s not, big brothers are suppose to help protect his younger siblings not hurt them”. I made him apologize, told him he’s not getting anymore toys and that when he gets home from school he’s to clean the living room and he bedroom, then after he gets to stay in his room, do his homework and not leave unless he has to go to the bathroom.

He didn’t like that and started crying. I still don’t feel like that’s enough just by all the stuff he has done and all I wanna do is whoop his ass. I just don’t know what else to do! I don’t want him to go to school acting like a bully either cause I won’t let that fly.

I just don’t know, I just feel like I’m about to break and whoop his ass and I don’t want too.