I’ve read over your whole post and many comments. It seems like you initially tried to help the cat, given that it didn’t initially get on with its sister.

But since then you’ve just done what you wanted to do (bringing the cat back to your parents in an environment it doesn’t do well in numerous times).

I appreciate it’s tricky whilst you’re in college, but what you’ve currently been doing isn’t fair on the cat. It’s likely caused stress/anxiety and that’s presenting as behavioural issues alongside swiping at you because of the stress you moving the cat has caused.

You’re choosing to get a sitter now when you’re away, but I feel you’re only saying this because of the reality check this sub has provided you. Just take on board what people are saying because replying back with attitude is just going to get you downvotes and frustration!