rabbit attack

Question
I have 2 rabbits ones a doe and the others a buck the buck had bit me once and bit my sister 3 times(the bites were very deep) he is getting more aggressive i was wondering if its because hes trying to protect the female. I really need help because i need to know if i need to give my pet away.  i need help Quick!!!!

Answer
Is your buck neutered?  An un-neutered male can get territorial and start engaging in aggressive behavior.  Sometimes, they'll be protecting their cage, room, or another rabbit that they are friends with.  
Is your female spayed?  Even a neutered male may start to feel protective of an intact female.
Have you noticed anything that always seems to trigger his biting?  For instance, does he always bite when you stick your hand in the cage?
How long have you had him?  And is he used to contact with people?