What has been Related About The Inheritance For The Grandfather

'Imran bin Husain narrated:

"A man came to the Prophet ﷺ and said" 'My son died, so what do I inherit from him?' He said: 'For you is a sixth.' When he turned to leave,he called him and said: 'For you is another sixth.' So when he turned to leave , he called him saying: 'The last sixth is consumable for you.'"