If your mate wants a male rabbit to keep the other one company they will probably fight unless they are both neutered (and even then there is no guarantee). I had two female rabbits that had lived together since birth and started fighting at about age 1. I had them both spayed and one died in the operation and now my remaining female is bonded with a male and they get on really well. Females can get very territorial sometimes with each other. The babies shouldn't be separated from their mother until they are 10 weeks old. Good luck!