So after much thought I decided that I wanted to expand my kitty family by adding a kitten, the only thing that's holding me back is my older cat Riley. I have two cats, both indoor, Riley will be 5 this year and Mia will be 3. When we first got Riley he was 3 months old and was the only cat of the house for two years until we brought home Mia. At first they got a long fairly well, they would lay with each other, but now they don't really bother with each other and stay out of each others way. Riley has these moments where he gets like this "roid rage" and if Mia goes into the basement aka his "man cave" he'll chase her back upstairs and attack her. This is only every once and a while but sometimes it gets to the point where they have to be isolated because he's being mean. I'm scared to bring home a kitten with his sporadic behavior, I don't know how he'll react and I'm scared as the kitten gets older and ventures down into the basement he'll attack it and the kitten won't be able to defend itself. Should I just abandon hope of adding to my family or is there anything I can do to help with his behavior?