Oh. I was so terrified when I brought the kitten home. Not for the kitten though, she could look after herself. The adult stayed on my bed, which isn't easy for cats to do. I was worried he'd think we didn't love him anymore. (Make sure your cat feels still feels loved). My cats started staying in the same room together after a couple of days, maybe a week. Its been 9 months and feeding time is hectic. The kitten, who isn't much of a kitten now, scoffs her food down and tries to eat the adults, who is kinda a push over and very nice for a male cat (Seriously he seemed like a metro sexual or gay guy). They play nicely now. mostly. When my male gets sick of her he sits on top of my bed, down the hall or on the fridge. But My Mikey has always been a sweet little boy, who terrorises the cats outside behind our back, and isn't really bothered by much and is very loyal. (seriously Mikey follows me to the bus stop in the morning. I stayed at a mates one night, came back and we couldn't find him. Walked all the way up to the bus stop where he'd been since I left meowing at every bus that cam passed.)
Edit --- Mikey and Tiger now curl up together sometimes too. (And we've caught them curled up with their kittens)