Is it obligatory to repay the remainder of the loan to the family of the deceased manager, knowing that he stated twice that he forgives the rest if he dies?

The creditor's statement, "If I die, then I forgive the debt," is considered a release contingent upon death, and its ruling is that of a bequest (wasiyyah (definition)). If the one released from the debt is not an heir, the release is executed within the limits of one-third of the estate. Whatever exceeds one-third depends on the approval of the heirs. If the debt is equal to or less than one-third of the estate, the debtor's liability is cleared. If it exceeds one-third, the excess depends on the heirs' permission; otherwise, it must be given to them.