Yes, agreed with Monkeybun and Sam. Rabbits don't really have the concept of family. If you adopt siblings as babies you would have to separate them right away and until they are both spayed and neutered, otherwise they will mate (even though they are siblings). Then there is no guarantee they will be bonded or get along with each other (the chance of them bonding doesn't increase because they are siblings or family), and chances are they might not even remember each other. If you adopt an already bonded pair of rabbits from a shelter then you know they will get along, they will already be altered (saves you lots of $$), and you won't have to go through the process of bonding, which can be difficult. Pairs also commonly don't get adopted as quickly as other rabbits because often someone will think that two would be too much work or they just only want one, so you'd be really helping out 