we initially had two kittens, and at ten months we had to get rid of one (for one reason or another). our cat was absolutely fine, and probably even more loving than when we had the two of them. anyway, six months later my husband wanted another cat, but i was unsure about how she would react. i got talked around the the idea tho! we got a kitten, and the older cat was very uneasy around the new kitten. it took a good few days of hubby sleeping on the sofa with one cat, while the other slept with me upstairs. they are getting used to each other now, playing together. but bare in mind, these are females. females tend to be more mothering, i dont know how a male would react as ive never had a tomcat.