Al-Kāfi
Hadith 3397- مُحَمَّدُ بْنُ إِسْمَاعِيلَ عَنِ الْفَضْلِ بْنِ شَاذَانَ عَنْ صَفْوَانَ عَنِ ابْنِ مُسْكَانَ عَنِ الْحَلَبِيِّ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ سَأَلْتُهُ عَنِ الإخْوَةِ مِنَ الأمِّ مَعَ الْجَدِّ فَقَالَ لِلإخْوَةِ لِلأمِّ فَرِيضَتُهُمُ الثُّلُثُ مَعَ الْجَدِّ.
7. Muhammad ibn ’Isma‘il has narrated from al-Fadl ibn Shadhan from Safwan from ibn Muskan from al-Halabiy who has narrated the following: “I once asked abu ‘Abd Allah (a.s.), about the case of brothers from one’s mother with a grandfather. He (the Imam) said, ‘The ordained share of brothers from one’s mother is one-third if a grandfather is with them.’”