Yup, cats are all about territory. Also, in our experience, females tend to be more jealous about our spending time with other cats (at first), so there may be a little bit of that at play too.
With cats, it's all about time, and they go at their own pace. The scent swapping and doing things to help Ally associate Ollie with good things can help.... but they're young enough they WILL get over it. At least he's starting to stand his ground, and that's a good thing! I know the tension between the two of them is hard to take, but having a kitty that lets himself be bullied is even harder.
How much vertical space do you have? This can really help diffuse alpha-status and territory tensions. I know it'd be one or two more things to move when you go, but providing space for Ally (or Ollie) to go "up" may also help.
Laurie
With cats, it's all about time, and they go at their own pace. The scent swapping and doing things to help Ally associate Ollie with good things can help.... but they're young enough they WILL get over it. At least he's starting to stand his ground, and that's a good thing! I know the tension between the two of them is hard to take, but having a kitty that lets himself be bullied is even harder.
How much vertical space do you have? This can really help diffuse alpha-status and territory tensions. I know it'd be one or two more things to move when you go, but providing space for Ally (or Ollie) to go "up" may also help.
Laurie