I've had Vlad and Oksana since they were kittens, and Oksana always hisses at Vlad if he gets too close and she's not in the mood for him. Czari gets along with most of the others, but she only really plays with Maks. I figure, as long as they all tolerate each other and get along okay, then it's a success.
I'm sure things will begin to work itself out with them. Just take your time with the introductions.
