Sunan Ibn Majah, Book 23, Hadith 2829 (In-Book) ⓘ
It was narrated from Ibn ‘Abbas that the Messenger of Allah gave a grandmother one sixth of the inheritance.
حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ عَبْدِ الْوَهَّابِ، حَدَّثَنَا سَلْمُ بْنُ قُتَيْبَةَ، عَنْ شَرِيكٍ، عَنْ لَيْثٍ، عَنْ طَاوُسٍ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم وَرَّثَ جَدَّةً سُدُسًا .
also referenced under: Hadith 2725 (Reference) & Volume 4, Book 23, Hadith 2725 (DarusSalam)