A friend of ours and his wife just returned from Massachusetts on Christmas Day. He had been up to visit his brother but it wasn't for a family reunion.
His brother was very ill and struggling with failed kidneys and constant dialysis. Our friend went to donate one of his healthy kidneys to his brother. The procedure went well. The doctor said the transplanted kidney started working within minutes. Days later, his brother's pallor pinked right up after being a pasty white.
Our friend's son said "I hope my brother will be there for me if I get sick."
In that family, I suspect he will.