My three year old step son is A DEVIL CHILD! HE CONSTANTLY MISBEHAVES! WHAT SHOULD I DO?

Don't divorce your hubby. You have to be patient. If your at home with him all the time, start trying to communicate. If he starts screaming and yelling then put him on timeout. He would probably run away so you should explain to him what he's doing wrong, and re position him on timeout. If that doesn't work, then remove evrything that's in his room that can be of entertainment to him and put him in his room. Of course he will yell and scream but it will only last so long. He will soon get tired and fall asleep. When he wakes up remind him what he has done wrong, and then explain why not to do thAt. Have you told your hubby yet? Explain it to him. If none of these things work then you hve to understand that he is in pain and upset because his mother has just died. You have to give him time but also be a good leader figure fr him, because he doesnt know any better