As said above, keep playing/feeding/cuddling her and she'll warm up. After all, you're the one that brought her into a new, safe home, so obviously she'll look to you for comfort. But over time she'll feel safe and secure around everyone in your family.
My girlfriend's cat is only now starting...
Our 2 (spayed) females don't mind sharing at all. We have one XXL (Maine Coon-sized) box and they both use it all the time. Though I do realise that we're very lucky to be able to have this one-box setup.
That said, what we have going on here goes against all the guidelines you'll find in books...
Of our 2 cats, the youngest one also tries to run away with her catch, so we needed a similar solution to you (all fun and games, until she crawls onder the sofa with it and get stuck).
So we purchased a "Flying Frenzy", which is the European answer to the American "Da Bird".
While the...
About the biter:
First of all, take the biter to the vet and have him checked out. There might be a medical reason behind it. If he's completely fine, well..
What are you doing when he bites you? Is he coming up to you just to bite you? Does he bite you when you pet him? Does he bite you when...
While the majority of us aren't professionals, we (or most of us) do have some experience with a wide variety of cat behavior issues.
Could you perhaps share some details on what exactly is happening and what you have done so far to introduce the cats to one another?
Proper attacking would involve a ton of noise, hissing and the typical angry yowling. They will also first circle each other with their hair standing up and backs arched.
Yours seem to like each other (cats won't groom other cats if they hate them, so yea.. I think they're just playing :)
If...
In that case, I think the kitten is just starting to develop his personality (and right now that's the personality of a teenager) and the older cat doesn't like that personality.
Just like with humans, we can't expect cats to like everyone.
Just to be sure: are both cats neutered? If not, the issue might be that the older cat is sensing some sort of threat because the kitten's hormones are kicking in.
We're currently using a scratching barrel of about 3 feet high and a heavy duty re-board custom-made tree.
The barrel has 3 levels for them to sit and play in, and an extra padded area on top for them to sleep on. There's little to no risk tat it'll ever fall over and can handle quite a beating...