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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
bayhaqi:12367 – Abū Saʿīd > Abū ʿAbdullāh > Muḥammad b. Naṣr > Wahbb. Baqiyyah > Khālid > Ḥumayd > ʿAmmār b. Abū ʿAmmār > Zayd b. Thābit

[Machine] If the grandmother is from the mother's side, then she is entitled to one-sixth.  

البيهقي:١٢٣٦٧ – وَأَخْبَرَنَا أَبُو سَعِيدٍ أنا أَبُو عَبْدِ اللهِ ثنا مُحَمَّدُ بْنُ نَصْرٍ ثنا وَهْبُ بْنُ بَقِيَّةَ أنا خَالِدٌ عَنْ حُمَيْدٍ عَنْ عَمَّارِ بْنِ أَبِي عَمَّارٍ عَنْ زَيْدِ بْنِ ثَابِتٍ قَالَ

إِذَا كَانَتِ الْجَدَّةُ مِنْ قِبَلِ الْأُمِّ أَقْعَدَ فَهِيَ أَحَقُّ بِالسُّدُسِ