Gosh, what a dilemma you have. There is definately a power struggle going on in your household!

Here's something to think about. Can you determine which one is the "top cat" of the two? Once you've done that, is there anything that you humans can do show the cats that you respect their heirarchy? For example, you could give the "top cat" attention first, or food first, or praise first - something to let them know that you recognize who the real leader of the bunch is?

Our Sid is the "top cat" in our house, so he always gets his food first. The others don't act jealous and they tolerate the situation.

Also, there are books available about cat behaviorists and cat psychology that can give advise.

Best of luck and keep us posted.