Man, this is rattling around in my little pea brain looking for a spot to stick. It just doesn't seem to fit any existing folder.
It's an incredibly generous and noble act, especially for a stranger.
It's also a dangerous thing for you to undertake, just because it's major surgery, without the other factors. I'm guessing you've investigated the pros and cons. Probably your friends have chewed your ear off, with reasons you should or shouldn't do it.
All I can say is good luck, I hope everyone lives happily ever after.