Is a sum borrowed from a father considered a debt that must be repaid, especially if the father says, "There is nothing you will inherit" after a long life, knowing that the father considers the sum a debt and requires repayment upon financial expansion, and he is now 69 years old?

The borrowed amount is a debt that must be repaid unless the lender, by their own free will, absolves the borrower. Inheritance occurs after death. A father must be just among his children in giving gifts, and it is not permissible to prefer one over another unless there is a legitimate reason, such as the preferred child's need. Preferring children without a legitimate reason is considered injustice and oppression. If a father shows favoritism in giving, he sins, and he must return what he favored some with, or give the others what completes their share. If he does not do so, then the favored one must return the excess to his siblings. The unjust father must be advised and reminded of what is right.