“I once wrote to abu Muhammad (a.s.), and asked about the case of a man who has two sons. One of them dies, leaving behind male and female children, and the grandfather bequests for them the share of their father, if male and female in this share are equal or if the male has twice the share of the female. He (the Imam) (a.s.), signed the answer that said, ‘The will of their grandfather must be executed by the will of Allah.’ He (the narrator) has said that a man wrote to him (the Imam) about the case of a man who has male and female children and he confirms that a piece of property belongs to his children without mentioning if it is according to the share Allah, most Majestic, most Glorious, has determined or male and female share it equally.’ He (the Imam) signed the answer that said, ‘They must execute the will of their father according to what he has mentioned. However, if he has not mentioned anything they must refer to the book of Allah, most Majestic, most Glorious, and the Sunnah of the Holy Prophet, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, by the will of Allah.’”