R.V.
That is a hard one. I read the other responses and putting him in time out and give the other child full attention, where he can see it, works great if his love language is time and affection. My oldest (13 now) when he started biting I did what my Grandma did to us ..... she bit us back in the same spot .... hard! He never did it again. I am not sure if that is the best way to handle it or not.
Good luck
R.