Our amazing cat had to be put down in June. I haven't had a kitten since 2006. We adopted a 2 month old kitten about 6 weeks ago, he is now about 3.5 months. 2 weeks ago we adopted a brother and sister that are now about 2.5 months old. The 2 are so chill. The first kitten has his moments of being a very friendly cat but also think he could be the spawn of Satan. He can be down right vicious to the other male kitten, mostly because the younger male kitten is very passive and allows the older one run the show. The female kitten at least stands up for herself, so she isn't messed with much. How can I get them all to coexist a little better? I am actually starting to be concerned for the younger kitten's safety. I have never had a cat this stubborn or mean. At this point I am keeping them separated most of the time.