What is the ruling of Islamic law regarding the inheritance of my maternal grandmother, who passed away leaving a son and a daughter, and who had relinquished her share of my mother's (her daughter's) estate to us, but this relinquishment of the two apartments and agricultural land was not documented? Note that the children of her deceased sons inherit with us in her portion of my mother's inheritance, and that my grandmother had previously relinquished her share of the estate of her children who died before her to their children?

The children of the grandmother's sons inherit nothing because they are excluded (deprived) by the son. The maternal siblings inherit from her if she does not leave behind a male lineal descendant or a father.

If the grandmother agrees to relinquish her share, or if her adult heirs waive their shares, then there is no problem. Otherwise, evidence must be presented.

For a deceased grandmother who leaves behind a son, a daughter, three grandsons (sons of her son), and two granddaughters (daughters of her son), her share is divided such that the male receives the equivalent of the share of two females, and the grandsons and granddaughters (children of her son) receive nothing.

Matters of inheritance are complex and critical; therefore, they must be referred to the Sharia courts for investigation.