Well my daughter has 3 male brothers or they thought they were brothers. They were all found at one time. One is a tuxedo, one orange tabby and the other looks Siamese like. They were all the same size when she got them. Anyway they get along just find and in small living space. I think they had a few spats (nothing serious) when they were younger. Now they are 6-7 years old and just kind of go their own way but do sleep together now and then.