i have a 5 months african grey called freddie the problem i have with him he will only go to myself and my hubby he lets us do anythink to him and he follows us around but when it comes to my sons who r 18 and 16 he wont let them touch him he just gos to bite them i am wondering if there is anythink we can do as we r going away in sept and my niece is going to be looking after him at our house and it seems like him dont like other people coming near him