Hi there, welcome!
Rey and Joy are having trouble because they aren’t bonded properly. They probably got along at first because he was young and hadn’t hit puberty.
In order for rabbits to live together peacefully, they need to be properly “bonded”. In order for that to happen, they will BOTH need to be spayed and neutered.
The subject of intentional breeding is prohibited on this forum, so all I will say is that if you want them to live together peacefully, they should both be spayed and neutered, and then you will need to go through the bonding process with them (which means letting them sort out their dominance in neutral territory, with you supervising to prevent fighting). I recommend reading the bonding info under the “Bunny info” tab at the top for more detailed info.
Unspayed females also have a very high rate of uterine cancer (about 75% by age 4), so I highly recommend you spay Rey once her babies have weaned.
For now Joy should definitely be kept separate from Rey and the babies. The fur pulling is a dominance display… you should also give them a once over for any injuries you might not have noticed. Once they babies hit puberty they should all be separated as well.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.