I do understand about feeling kind of guilty. But the truth is that those who give, whether it is an organ or something less dramatic, also receive through their gifts. Doing something for others is so important and rewarding. We often forget that it is extremely meaningful to give something.
We have a friend who wanted desperately to give a kidney to my husband. She is still very upset that she was denied. And I, also wanted to donate. It was odd because I wanted to donate, but I didn't especially want to go through surgery. My kidneys weren't good enough, though.
The important thing is to accept the gift graciously and with expressed gratitude.
I'm so pleased for you and for your sister in law.
Aleta