Is it permissible for parents to relinquish a debt owed to them by their deceased son, and will the son be tormented by this debt after their relinquishment?

A debt is a right belonging to its owner, and if the owner of the debt waives it, the debtor's liability is cleared, and the sin is lifted from him. Therefore, the deceased will not be punished for a debt that its owners have waived. This forgiveness is permissible and praiseworthy, and it is considered an act of benevolence, as Allah the Almighty says: (And those who restrain anger and pardon people—and Allah loves the doers of good).