All the best wishes from here.
Not knowing your family in details, it is hard to say if the initial reaction was just an effect of the shock you gave them.
They may soften up, or they may congeal into a lump of icky, sticky evil.
I am sorry to hear about your cat (and I do not even like cats!). Be careful, because it could be used for bait and leverage.
It will however also have the role of "the miner's canary": If they take it out on the cat, you have a pretty clear diagnosis of "icky, sticky evil", and you should probably be even more careful.
Do be careful. It is not unheard of, that "unruly children" are whisked away to the outback of the "old country" to be "re-educated in the true values"
Run through the CEMB list of cyber safety and get an app on your phone to record calls. Documentation is your friend!
I'm happy to hear that you toned down the letter (imagine how much they would have gone crazy on the original one). Now they are the ones who have over-reacted. Likewise it is great to hear that the police were cool.
Should there be more threats of a kind that justifies police intervention, then refer to the previous cases.

Thank you!
If they soften up, that would be great. But if not then thats just something ill have to live with.
Thats what i was told by the police. Ive been advised by many not to give into the temptation of going back home.
Dont worry, im not going to see them any time soon, i dont plan on going back to the "old country".
Ive already read through it

and a call recorder sounds good!
Im glad i didnt stick to my original letter, i think i was expressing a lot of anger. I sent an email apologising for leaving due to my lack of faith and sexuality, i also told them that i love them very much.
Im keeping my phone with me at all times incase they wait outside my college.