You should find out your compatibility first. Then you can offer your transplant. I would not discuss your medical plans with your sibling and only with the doctor. If you are a match and the recipient chooses blood free surgery perhaps you, if you are the donor, could choose surgery without that restriction. In the USA confidentiality laws limit what can be told to anyone so you could keep your decision confidential.
The correct answer. Your medical procedures are between you and your doctor, nothing to do with your family.