When we first bought Boss home, Kinky got a little bit jealous. I suppose it was only natural, she had been the centre of attention, getting all the fuss and now she had be unsurped by this "runty" little kitten! She looked at him with distain and sulked for days. Boss was so small and his tail was really thin like a little pigs tail. I remember I lifted his tail to look at it and he gave a great big angry meow. When he got a little older his tail did eventually become thick and bushy.
We used to have all these little cat toys, a squeaky mouse, a plastic ball etc and used to try and get Boss to chase them and play. He used to get hold of the ball in his mouth and walk around growling and after a while he got tired and went to sleep. Kinky on the other hand would chase around and play for hours on end, even when she was an older cat.