I have a Ragdoll kitty that I got at 12 wks. he is now about 15 wks. I just got another Rag doll, same breeder 12wks old. brought them together and in the beginning all was well,then Kiss the older started chasing Hershey the baby,now they are both males the older kitty has been laying in the younger kitty's litter box???he has been grabbing the lil one by the neck ,neither is neutered yet?is this a sexual issue [their both babies] or some thing else. Any answer will be appreciated.