Hello I have 3 boys, about three months old that came from the same breeder at the same time and have been together their whole lives, but I’ve noticed that two of them always leave the third out. He’s the smallest and not one of their brothers. The other two are bigger and brothers and the always cuddle together instead of with the third. They team up on him and sometimes push him off shelves and try to stay away from him for the most part. Would it be better to get the third a friend so they are in pairs?