Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:4-2217bal-Shaʿbiá
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السيوطي:٤-٢٢١٧b

"عن الشَّعْبِى قَالَ: كَان عَلِىٌّ وَزَيْدٌ يُطْعِمَان الجَّدَةَ أَوِ الثِّنْتَيْنِ أَوِ الثلَاثَ، السُّدُسَ لَا يَنْقُصْنَ مِنْهُ وَلَا يَزِدْنَ عَلَيْه إِذَا كَانَتْ قَرَابَتُهُنَّ إِلىَ الميِّتِ سَوَاءً فَإِنْ كَانَتْ إحْدَاهُنَّ أَقْرَبَ فَالسُّدُسُ لَهَا دُونَهُنَّ".  

[ق] البيهقى في السنن

See similar narrations below:

Collected by Bayhaqī
bayhaqi:12361Abū ʿAbdullāh al-Ḥāfiẓ > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Yaḥyá b. Abū Ṭālib > Yazīd b. Hārūn > Muḥammad b. Sālim > al-Shaʿbī > Kān

[Machine] Ali and Zaid feed the grandmother, whether it's one-sixth, two-sixths, or three-sixths. They do not decrease or increase from it if their relationship to the deceased is the same. However, if one of them is closer, then the sixth belongs to her alone, separate from them. Abdullah used to distribute among the closer and farther in the sixth if they are in different places. The grandmothers are not excluded from the sixth, except for the mother.  

البيهقي:١٢٣٦١وَأَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ ثنا يَحْيَى بْنُ أَبِي طَالِبٍ أنا يَزِيدُ بْنُ هَارُونَ أنا مُحَمَّدُ بْنُ سَالِمٍ عَنِ الشَّعْبِيِّ قَالَ كَانَ

عَلِيٌّ وَزَيْدٌ ؓ يُطْعِمَانِ الْجَدَّةَ أَوِ الثِّنْتَيْنِ أَوِ الثَّلَاثَ السُّدُسَ لَا يُنْقَصْنَ مِنْهُ وَلَا يُزَدْنَ عَلَيْهِ إِذَا كَانَتْ قَرَابَتُهُنَّ إِلَى الْمَيِّتِ سَوَاءً فَإِنْ كَانَتْ إِحْدَاهُنَّ أَقْرَبَ فَالسُّدُسُ لَهَا دُونَهُنَّ وَكَانَ عَبْدُ اللهِ يُشْرِكُ بَيْنَ أَقْرَبِهِنَّ وَأَبْعَدِهِنَّ فِي السُّدُسِ إِنْ كُنَّ بِمَكَانٍ شَتَّى وَلَا يَحْجُبُ الْجَدَّاتِ مِنَ السُّدُسِ إِلَّا الْأُمُّ