بَنَاتُ الِابْنَةِ يَقُمْنَ مَقَامَ الْبِنْتِ إِذَا لَمْ يَكُنْ لِلْمَيِّتِ بَنَاتٌ وَ لَا وَارِثٌ غَيْرُهُنَّ وَ بَنَاتُ الِابْنِ يَقُمْنَ مَقَامَ الِابْنِ إِذَا لَمْ يَكُنْ لِلْمَيِّتِ بَنَاتٌ أَوْلَادٌ وَ لَا وَارِثٌ غَيْرُهُنَّ.
“Abu al-Hassan, al-Awwal (a.s.), has said, ‘Granddaughters replace their mother if the deceased does not leave behind any daughters and there is no other heir. Daughters of one’s son replace one’s son if the deceased does not leave behind any daughters of children and there are no other heirs besides them.’”