If these rabbits are housed together, no matter what sex they are or if they’ve been together their whole lives, at 4 months of age they need to be separated. You are either risking an unwanted litter or you are risking fighting and injuries.
You’ve gotten some good advice regarding finding homes for them. If you try to find homes for them on your own, make sure that the potential adopters know all about rabbit care and their ways, and that they are a long term commitment. So many people don’t know all that goes into their care, and they are soon wanting to be rid of them.
Right now, some of the rescues are not adopting out rabbits because they don’t want them used a live toys for Easter. Plus, they may be reserving any available space that they have now for the Easter rabbits who will be dumped in a couple of months. So it may be even harder to find any rescues that will take them at this time.