Inheritance in an integral part of Islamic Shariah Law and its application in Islamic society is a mandatory aspect of Devine teaching of Islam. Hence, there is a legal share for relatives of the deceased in his estate/property.
Narrated Abdullah bin Umar: Allah's Apostle said, "It is not permissible for any Muslim who has something to will to stay for two nights without having his last will and testament written and kept ready with him." [Sahih al-Bukhari].
Doctrine of al-Awl (العول) and Doctrine of ar-Radd (الرد), and other cases like Adopted Child (تبنّي), Illegitimate Child (ولد الذنا), Unborn Child (جنين), Hermaphrodite (خُنثىا المـُشَكَّل), Missing Person (مفقود)
Primary Heirs or Obligatory Heirs are referred to as Ashab-ul-Furud (أصحاب الفروض) means “possessors of obligatory share”. These are the family members with fixed shares whose share is exclusively set by Quran. Hence, they are called Quranic heirs or Obligatory shares.
The Prophet (ﷺ) said: Give fara’id to those who are entitled to receive it. Then whatever remains, should be given to the closest male relative of the deceased” [Sahih al-Bukhari]
Inheritance in an integral part of Islamic Shariah Law and its application in Islamic society is a mandatory aspect of Divine teaching of Islam.