Well I am a proud owner of 3 cats. I bought 2 kittens a while back when I already had a 10 year old cat. I moved out of my old apartment and toom my two kittens with me and left the 10 year old with her original owner at the apartment. Recently the owner told me they were going to have to give her to the animal shelter and i offered to take her back. Now I have the 3 amigos yet again. My problem is that of of my younger cats doesnt like this at all. They hiss at each other and fight. As well as the younger one is upset with this he keeps peeing on the bed to inform me that he is upset. I would like some advice in what could help becajse I'm totally lost. They liked each other before i moved out the cirst time and now it's just a nightmare. What should I do?