Your best friend is an identical twin. The other twin has been sick with a variety of illnesses most of their lives. Several times, the other twin has been so ill that your best friend has supplied tissue (e.g., blood, bone marrow) sometimes to help their sibling stay alive. The other twin now needs a kidney transplant to stay alive. Their parents have assumed that your best friend will automatically donate the kidney as usual when tissue has been needed. However, your friend is now balking at this automatic assumption of donation and is considering saying „no‟. What would you say to your friend to convince him to donate the kidney?