The Sufficient (Vol 7) · Hadith 293 (#Ḥadīth #2)

2- عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ سَعْدِ بْنِ أَبِي خَلَفٍ عَنْ أَبِي الْعَبَّاسِ عَنْ أَبِي عَبْدِ اللهِ قَالَ إِذَا تَرَكَ الْمَيِّتُ أَخَوَيْنِ فَهُمْ إِخْوَةٌ مَعَ الْمَيِّتِ حَجَبَا الأمَّ عَنِ الثُّلُثِ وَإِنْ كَانَ وَاحِداً لَمْ يَحْجُبِ الأمَّ وَقَالَ إِذَا كُنَّ أَرْبَعَ أَخَوَاتٍ حَجَبْنَ الأمَّ عَنِ الثُّلُثِ لأنَّهُنَّ بِمَنْزِلَةِ الأخَوَيْنِ وَإِنْ كُنَّ ثَلاثاً لَمْ يَحْجُبْنَ.

2. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from Sa‘d ibn abu Khalaf from abu al-‘Abbas who has narrated the following: “Abu "Abd Allah , has said, "If a deceased leaves behind two brothers, they are considered more than two brothers of the deceased and they bar the mother from one-third. If there is one brother he does not bar the mother.’ He (the Imam) said, "If there are four sisters they bar the mother from one-third because they are like two brothers but if there are three sisters they do not bar the mother’s share.’”

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).