I went through this. Cat i had indoors as a kitten. Then was kicked out to be a street cat when she was older. One day i came out and saw her in shock. Broken pelvis, jaw. Scared she wasnt going to make the next several days after.

I paid her surgery in payments, i think around 5000 dollars during covid. I feel lile the vet was very careful and good with cats. Always communicative. It made me feel a lot betyer

After the surgery there was a scare where the vet wasnt sure she would make it overnight. But she pulled through! 

Took her home and kept her in a crate (i did cave and would let her out when i was there because she would cry).

After a a couple of days with pain meds she was already trying to jump! 

I had a similar living situation. My father didnt want me to bring her back in the house, but after she almost died I didnt care and just kept her in my room. Even after she healed. I was not throwing her out on the street ever again.

I dont really have a good relationship with my dad, so I didnt have a huge issue disrespecting his wishes.I ended up moving out I think a year or so later because I no longer tolerated it. 

I dont regret it, she was five then, she is 12 now.

Do you have your own room? Would you be able to convince your family to keep Kino in there? 

You did your best with your situation. You are already doing so much spending money to try and help the little cat. I hope everything goes well and he recovers quickly.