If his son dies, he may give his children his son's share of his estate during his lifetime, or bequeath to them an amount not exceeding one-third.
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The first question of Fatwa No. ( 10617 )
Q1: A man has two sons, six daughters, and three wives, and he is still alive, andhis eldest son has passed away, and his eldest son had children, both sons and daughters, and this man wants to give the inheritance share of his eldest son to the children of his deceased eldest son, so is thispermissible in the Shari'ah, and if it is not permissible for the children to take the place of their father in the inheritance while he is deceased, is it permissible for the grandfather to
bequeath to the children of his son from his wealth, before he dies, an amount equal to the inheritance share that would have gone to the father if he had been alive after the death of his father?
A1: It is permissible for a man to give the children of his son the share their father would have received if he had been alive, by giving it to them while he is in good health. It is also permissible for him to bequeath to the children of his son, provided they are not heirs from their grandfather, up to the limit of one-third, if this is his only bequest. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Q1: A man has two sons, six daughters, and three wives, and he is still alive, andhis eldest son has passed away, and his eldest son had children, both sons and daughters, and this man wants to give the inheritance share of his eldest son to the children of his deceased eldest son, so is thispermissible in the Shari'ah, and if it is not permissible for the children to take the place of their father in the inheritance while he is deceased, is it permissible for the grandfather to
bequeath to the children of his son from his wealth, before he dies, an amount equal to the inheritance share that would have gone to the father if he had been alive after the death of his father?
A1: It is permissible for a man to give the children of his son the share their father would have received if he had been alive, by giving it to them while he is in good health. It is also permissible for him to bequeath to the children of his son, provided they are not heirs from their grandfather, up to the limit of one-third, if this is his only bequest. And success is from Allah, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and his Companions.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.