The Stray Cat I've been feeding Died

There's this tabby cat my caretaker used to feed before she went away and I felt obligated to take care of it. He was so pretty and very social... always responded when I called for him and enjoyed being scratched on the back of his head. My father and older sister would kick it out of the house since it usually just lounges around in the kitchen... I got into an argument with my sister since she was so verbal about wanting for it to die. There was an incident in her room a few days before our disagreement where a stray ginger cat had left its shit and piss on her bed while she was away and so she hates cats in general now. We haven't spoken to each other a week after that argument.

Moving back to the cat, a couple of weeks ago, he sounded weaker than usual and his eyes were red but it went away...I haven't heard or seen him in a while but my younger siblings said he died..I don't know, thats the first cat I've ever grown to love because I used to hate the strays for stealing food and shitting all over the house. The reality of the situation hasn't affected me just yet but man he was so sweet and lovely...