'Abdullah bin Mas'ud said, about the grandmother along with her daughter:
"The Messenger of Allahﷺ gave the first grandmother, along with her son, a sixth for them to consume while her son was living."
• Jami` at-Tirmidhi, Vol. 4, Book of Inheritance, Hadith 2101b
• Jami` at-Tirmidhi, Book of Inheritance, Hadith 2101b