In Islamic law, the share of women’s inheritance is half that of men’s. Allah, the Almighty, has stated in the Quran:

“Allah charges you in regard with your children: a son’s share is equal to the share of two daughters; if the [children] are [only] daughters and two or more, their share is two thirds of the legacy, and if there is only one daughter, her share is half [of the legacy]; and each of the parents inherit one-sixth of the legacy if the deceased had children, and if the deceased had no children and the parents are the only heirs, the mother inherits one-third; if the deceased had brothers, the mother inherits one-sixth; [all this is] after executing the will and settling the debts of the deceased. You do not know which of your parents and children benefit you the most. This is Allah’s injunction; surely Allah is All-knowing, All-wise.”

- Surah Nisa’ 4:11.

Ibn Abil‘uja’ said to Ahwal, ‘Why should a weak woman get one share while a wealthy man gets two shares?’ He answered, ‘I asked this same question of Imam Sadiq (‘a), he answered: ‘Aqilah (blood price)5, nafaqah, and Jihad—and some other things—are not obligatory for women, they are for men; thus, two shares have been designated for men and one for women.’