ʿUbaydullāh b. Mūsá > Ibn Abū Laylá > ʿĀmir al-Shaʿbī

From four parts for the woman, there remains a quarter, and for the mother, there remains a third of what is left, and what is left, belongs to the father. – Weak Chain

أَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ مُوسَى عَنْ ابْنِ أَبِي لَيْلَى عَنْ عَامِرٍ الشَّعْبِيِّ عَنْ عَلِيٍّ فِي امْرَأَةٍ وَأَبَوَيْنِ قَالَ

مِنْ أَرْبَعَةٍ لِلْمَرْأَةِ الرُّبُعُ وَلِلْأُمِّ ثُلُثُ مَا بَقِيَ وَمَا بَقِيَ فَلِلْأَبِ – إسناده ضعيف