Is a sick person sinful if he refuses a liver transplant operation, to be donated by his son, fearing for his son from any potential danger and out of apprehension of the exorbitant material costs?

Organ donation from living donors is permissible if the donor is not harmed and the recipient is in urgent need, and the success of the operation is highly probable. If the patient fears harm to his son from the donation and refuses the operation for that reason, he is not sinful, because medical treatment is permissible. The patient is advised to consult trustworthy doctors. If they confirm that there is no harm to his son, then he should put his trust in Allah and proceed with the operation, and ask charitable individuals and organizations to cover the costs, while supplicating and turning to Allah Almighty.