Sorry I'm late back Neti.....
I'm also very sorry to hear about your sister too. You're not having a very good time of it lately & I do feel for you all.
If the medical team find that you're not a suitable donor, for whatever reasons, or that you decide against going ahead, I do hope the transplant co-ordinators find a healthy kidney for your relative.
I have to be honest here - if it were me, I would be just as concerned that one of my daughters may need it in the future - God forbid.
So try not to beat yourself up about it Neti, your heart's in the right place & your relative would know this.
Take care. -xx-