My son was recently diagnosed with autism he is 19 months old and I have a daughter 2 1/2, she has been acting out biting him, normally she is very loving towards him and always looks out for him (like she can tell he needs a guardian angel) but he has always been very jealous of her and sometimes down right mean trying to kick, hit, slap, push, whatever if he wants her away from him or whoever is paying him attention, but we have never really had a problem with her being mean to him. The biting is really becoming a problem as I have found 3 different marks on him that stay a couple of days. They are well supervised and when we catch her we spank her or put her in time out and have her apologize to him but somehow she's still sneeking and biting him hard enough to leave marks. I don't know what to do