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.
bayhaqi:12291Abū Saʿīd b. Abū ʿAmr > Abū ʿAbdullāh b. Yaʿqūb > Muḥammad b. Naṣr > Muḥammad b. Bakkār > Ibn Abū al-Zinād from his father > Khārijah b. Zayd b. Thābit from his father > Maʿānī Hadhih al-Farāʾiḍ And ʾUṣūlahā > Zayd b. Thābit Waʾammā al-Tafsīr Fatafsīr Abū al-Zinād > Maʿānī Zayd > Wamīrāth al-Jaddāt

[Machine] That the grandmother does not inherit anything with the mother, and in addition to that, she is obliged to receive one-sixth as a duty. And that the father's mother does not inherit anything with the mother or with the father, and in addition to that, she is obliged to receive one-sixth as a duty.  

البيهقي:١٢٢٩١أَخْبَرَنَا أَبُو سَعِيدِ بْنُ أَبِي عَمْرٍو أنا أَبُو عَبْدِ اللهِ بْنُ يَعْقُوبَ ثنا مُحَمَّدُ بْنُ نَصْرٍ ثنا مُحَمَّدُ بْنُ بَكَّارٍ ثنا ابْنُ أَبِي الزِّنَادِ عَنْ أَبِيهِ عَنْ خَارِجَةَ بْنِ زَيْدِ بْنِ ثَابِتٍ عَنْ أَبِيهِ أَنَّ مَعَانِيَ هَذِهِ الْفَرَائِضِ وَأُصُولَهَا عَنْ زَيْدِ بْنِ ثَابِتٍ وَأَمَّا التَّفْسِيرُ فَتَفْسِيرُ أَبِي الزِّنَادِ عَلَى مَعَانِي زَيْدٍ قَالَ وَمِيرَاثُ الْجَدَّاتِ

أَنَّ أُمَّ الْأُمِّ لَا تَرِثُ مَعَ الْأُمِّ شَيْئًا وَهِيَ فِيمَا سِوَى ذَلِكَ يُفْرَضُ لَهَا السُّدُسُ فَرِيضَةً وَأَنَّ أُمَّ الْأَبِ لَا تَرِثُ مَعَ الْأُمِّ وَلَا مَعَ الْأَبِ شَيْئًا وَهِيَ فِيمَا سِوَى ذَلِكَ يُفْرَضُ لَهَا السُّدُسُ فَرِيضَةً