Is it permissible to postpone the repayment of a debt owed to a friend, given difficult financial circumstances and the inability to pay immediately?

If an illness deprives a person of their awareness and free will, then they are not sinful for any damage they cause. However, they are not absolved from guaranteeing what they have damaged of another's property; rather, they must pay its value from their own wealth. The debt remains a liability upon you, and the creditor must grant the insolvent person respite until their condition eases. It is commendable for the creditor to charitably forgive the entire debt or a part of it. Your father is not obliged to give you money to pay off the debt.