We currently have 4 cats.

We had 2 at first (Jackson [male], Rosie [female]), then got 1 kitten (Twidgit). The other cats were a bit older, so they kind of kept their distance from her.

We then got another kitten (Ashton), and he and Twidgit play together. Their playing seems to have rubbed off on the older cats, who play much more now.

I have seen Jackson preening the kittens at times.