He, sallallaahu ‘alayhi wa sallam, supplicated to Allah for his relatives:

The Prophet of Allah, sallallaahu ‘alayhi wa sallam, supplicated for Al-’Abbaas and his children. Ibn ‘Abbaas narrated: “The Prophet of Allah, sallallaahu ‘alayhi wa sallam, said to Al-’Abbaas: “Tomorrow on Monday come to me with your children, so that I may supplicate Allah for you and them. Allah will benefit you and your children by my supplication.” So we came back the next day, and the Prophet of Allah, sallallaahu ‘alayhi wa sallam, put a cloth on us and said: “O Allah, forgive Al-’Abbaas and his children a forgiveness of their apparent and hidden sins, a forgiveness that will leave no sins, O Allah, protect and take care of him regarding his children.””