Child hitting parents

I'd be very concerned. I had 8 year old twins and one of them hit us, hit his brothers and worse, controlled all of what his twin did or said. He needs to pay restitution to whoever he hits or kicks, needs to be within your sight as much as possible, and needs to be in counseling(perferrable with and adoption/attachment specialist.) If at all possible, do not have the twins sleep in the same room and keep them seperated as much as possible unless you are present. Is this a foster or adoptive situation? I recommend researching a lot about attachment disorder.