Bulugh al-Maram #1101

Narrated 'Imran bin Husain (RA): A man came to the Prophet (ﷺ) and said, "My son's son (grandson) has died, so what do I receive from his estate (inheritance)?" He replied, "You receive a sixth;" then when he turned away he called him and said, "You receive another sixth;" and when he turned away he called him and said, "The other sixth is an allowance (beyond what is due)." .