introducing kitties....please help

[neko]

I have two kitties, 3 years and almost 1, both boys. I recently had to move out of my house and into an appartment building that does not allow pets. My parents agreed to take them until I could move somewhere that I can have them back. They have 3 female kitties all about 16 years old. Plus a female dog about the same age. My cats have beent here about 2 months now. Two of their cats really could care less about mine, they look at them funny and walk on by. My younger cat is the same way...with most things. The problem is one of their cats is agressive and so is my older one. Mine gets along with everyone else but her, she doesn't like either of mine.

I know it will take time for everyone to get comfortable with eachother but I was wondering if anyone had any sugesstions on how to get them to chill out abit. My mom says that they fight at least once a night that they know of. I'm afraid my parents are going to make me give them away if they don't start getting along their cats. Please help.