My husband just brought home a kitten that is about 8 - 10 wks. I have 2 other cats that are 2 yrs and 3 yrs..?

both males. Ollie( 3 yr ) is NOT happy about the new kitten. He won't attack him but he does hiss and growls at him. The problem is now he is growling at Kitty Kitty Bang Bang ( 2 yr ) and Bang Bang is actually going after Ollie. Bang Bang got Ollie pretty good on his nose and made him bleed. I don't know what to do! I cant let them in the same room at all . Any help would be greatly appreciated! Oh yea... Both cats are fixed!