What is the ruling on accepting a power of attorney to dispose of an inheritance under duress? Is it permissible for the mother to prevent the distribution of the inheritance or to dispose of it through buying and selling? Is it advisable to revoke this power of attorney? What is the ruling on delaying the division of the inheritance on the pretext that the heirs will inherit from the mother later?

All that your father-in-law left behind is rightfully for his heirs. His wife or anyone else has no right to prevent the division of the inheritance under the pretext that they will inherit her money after her death. She has no right to anything from the inheritance beyond her prescribed share, nor can she dispose of the heirs' shares except with the consent of all adult heirs. It is not permissible for the heirs to donate anything from the inheritance to their mother, or to permit her to dispose of it, unless it is done willingly, because what is taken out of shyness is not owned by the taker. If the heirs authorize their mother to dispose of the inheritance without their full consent, they have the right to revoke the authorization, as agency is a revocable contract.