My son is 4 years old. He has a bad attitude and is aggressive. He lies. I also have a 2 yr old daughter and a 1 year old boy. My 4 year old is teaching bad behavior to my 2 year old. My 4 year old is very sneaky. He gets into things and breaks his toys, tears everything up. He is very sneaky mean to my daughter and my youngest son. Just a minute ago my 1 year old was crawling around and my 4 year old litterally stepped on him to get over him. I'm scared to have my baby around him. My 2 year old and him both fight and hit and bite eachother..I don't know what to do anymore! I've tried everything from time out, spanking, taking his toys out of his room, taking his tv away (which he completely distroyed and doesn't work anymore) He completely doesn't listen to anything! He can't follow simple instructions! I don't know what else to do! Please any suggestion will help. I'm scared for the safety of my baby!