Is it permissible for the heirs to take the money that their father deposited in a bank in France in 1982 and died in 1991? And is this money considered usury?

The bank mentioned in France is a usurious bank, and its interests are from prohibited usury (riba). Unlawful wealth is not permissible for heirs; rather, it must be returned to its owner. If this is not possible, then it must be disposed of by spending it on charitable causes and for the benefit of Muslims.

If it is possible to identify the original capital and distinguish it from the usurious interests, then the inheritance to be divided among the heirs is the original capital.

If distinction is not possible, the amount of the unlawful wealth should be determined through diligent estimation (ijtihad). If the matter is entirely unclear, the wealth is divided into halves: they inherit one half and dispose of the other half.

Poor heirs may benefit from the interest to the extent of their needs, not according to their shares in the inheritance.