I'm sorry for him and his family, but when his sis said no, he should have said thanks anyway and let it go. Accept it like a man.
Instead, him and his wife are whining up a storm.
It sounds like him and/or his wife have been stalking the sis.
The examples and memories he is making for his kids are not pleasant.
He ought to follow his daughter's example.
If it was my brother or yours, and I was a perfect match, I would do it, but I won't condemn the sis for saying no.
You would fault a man for whining when he is about to die and leave 3 young children without a daddy?
You would fault his wife and mother of his children for trying everything possible to save him?
You want him to accept death like a man, when all it would take to help him live would be a loving act by his sister?