One of them was sick and they were going to get rid of her the next day. Turns out the problem was from tapeworms!
The other two are bonded twins and they were healthy when he adopted them but they are semi-feral cats. She is very friendly! 
The twins hide when people come around.
One way I try to look at it is like you. Had I not adopted these cats from the local kill shelter maybe no one would of, esp. the black cat that was so sick.
I gave them a home for 10+ years. I tried my best.
I just hope it doesn't have an awful ending as my health is no good either but I'm not knocking on death's door quite yet!
Thank you for your post! 
On edit: Paper Roses, maybe you should consider being a foster mom? Would that work out for you? You'd have yourself another kitty this way! 
I hate seeing any potential cat mom out there not have a kitty! There are so many that need homes waiting for YOU right now. Give it some thought! 
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