I asked Abu Ishaq: Does it mean a person who dies and leaves neither children nor father? He said: This is so. The people think it is so.
In-book : Book 19, Hadith 5
English translation : Book 18, Hadith 2883
19. 'Shares of Inheritance (Kitab Al-Fara''id)'
باب مَنْ كَانَ لَيْسَ لَهُ وَلَدٌ وَلَهُ أَخَوَاتٌ