
I had 3 cats, Fraggle (female spayed age 7) Doozer (male neutered age 6) Vader (male siamese cross, neutered age 3) all from kittens, the males were best of friends, the female is very timid, just kept out their way, I had a pretty settled household until a year and a half ago. I took on 4 x 3week old kittens from a friends farm, feral mum, they wanted the kittens removed before they too became feral.
My problem is Vader, he has a very Siamese personality and was very bonded to me and my partner, sleeping with us every night, he is also a big fighter and hunter, has a very strong prey drive frequently bringing home mice/rats even squirrels :O We were wary of him around these 4 tiny kittens, the older 2 cats accepted the kittens straight away, Vader hated them from the get go, snarling around their pen and taking his jealousy out on everyone including us and his best friend Doozer.. Our downstairs is open plan so the kittens came up to bed with us every night so the other cats could have the run of the downstairs/still come in and out the cat flap and the kittens needed bottles the first few weeks ... this did not help Vaders jealousy one bit

Almost 2 years later I have 6 cats who get on great, they eat, sleep, play together apart from Vader, he is still so very jealous, he still snarls and swipes at them (he has never attacked them) then runs off, he won't eat with them, and he still snarls at his old best friend Doozer ... I have had a lot of success getting Vader to bond with my eldest daughter, she gives him his treats and he mostly sleeps with her now and goes to her for cuddles but he still hates the "kittens" I feel awful that Vader got pushed out, he was just a year and a half when we got the kittens, very playful and we thought he would love the extra company, we all try to give him as much affection/attention as we can but if a "kitten" comes near him, even if he is on our lap or eating he still snarls and runs outside, he will even swipe at us if we get to close when he's in that mood, Everyone is starting to dislike Vader, he had a UTI last month which I put down to stress, he is permanently moody and time doesn't seem to be helping.