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.
darimi:2958ʿUbaydullāh b. Mūsá > ʿĪsá al-Ḥannāṭ > al-Shaʿbī

[Machine] Umar used to share with his brother and two siblings, and when they increased, he gave him one-third, and he gave him one-sixth with the child.  

الدارمي:٢٩٥٨حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُوسَى عَنْ عِيسَى الْحَنَّاطِ عَنْ الشَّعْبِيِّ قَالَ

«كَانَ عُمَرُ يُقَاسِمُ بِالْجَدِّ مَعَ الْأَخِ وَالْأَخَوَيْنِ فَإِذَا زَادُوا أَعْطَاهُ الثُّلُثَ وَكَانَ يُعْطِيهِ مَعَ الْوَلَدِ السُّدُسَ»