Oh Heather, your new kitten is so beautiful, you MUST keep him.

I think it's what you said before, Ruby was the baby and she's jealous of him because he is the only one smaller than her.

Or, maybe it's just the first time SHE's been bigger than any other cat in the family and she's feeling "superior". She might not "hate" him, it might be fun to her to have someone else to beat up on, like human siblings do.

Anyway I really hope it works out because he is so gorgeous.

When I was in Denver in July, my friend there had a new kitten with similar yellow-orange markings, and we had so much fun playing with him we almost didn't want to do anything else.

Let us know how it goes :crossedfingers
Sue