They need to be separated. If they are brother and sister, they will have babies unless separated. If they are the same sex, they will fight. Both girl siblings and boy siblings will fight, but the situation as a rule gets worse if they’re bucks. Bucks can fight to the death. They will eventually hurt each other. Bucks will go for each others’ man parts and try to sever them, and that is just as horrible as it sounds.

In the wild, rabbits run over vast areas, so a bad fight between rabbits usually ends with the losing party being chased off. Domestic rabbits don’t have that option, they must stay and fight, and they will fight. Between fights they can seem like the best of friends – and then the fighting starts over.

I’m sorry I don’t have any alternative course of action for you. There simply isnt any.

Bonding un-fixed siblings is not an option — you need to separate them. If you’re living with family members, talk with them and brainstorm solutions, which can also include rehoming one or both rabbits if you are not in a position to care for them properly.

I agree, you 100% must separate them now. They can hurt each other very badly if you do not, and castration is necessary for bonding.

I would check facebook marketplace, craiglist, buy nothing groups, etc to see if anyone is selling or giving away an exercise pen or dog crate, they can make good temporary bunny enclosures. Then if you cannot keep them separate permanently one should be rehomed. I’m sorry there isn’t an easy solution for this, many people are given the wrong info by pet stores and breeders about keeping rabbits together.

Why is separation not possible? How big is the enclosure? Would it be possible to split it in two? It isn’t ideal, but at least they would be separated until you can get them spayed.