We were once sitting with
The Prophet !( Allah's peace and blessings be upon him)
when a man from the tribe of Salmah came and said to him:-
O Messenger of Allah!( Allah's peace and blessings be upon him) do my parents have rights over me even after they have died?
You must pray to Allah to bless them with His Forgiveness and Mercy,
fulfill the promises they made to anyone, and respect their relations and their friends .
(Abu Dawud and Ibn Majah).
PROPHET MOHAMMED(SAW) SAID ,
"WHEN A MAN DIES, HIS ACTS COME TO AN END;EXCEPT THREE:
1.CHARITY(MADE BY HIM WHEN HE WAS ALIVE)
2.KNOWLEDGE(BY WHICH PEOPLE BENEFIT)
3.PIOUS SON (WHO PRAYS FOR HIM)
FROM THE POINT 3 IT INFERS THAT WE HAVE PRAY FOR OUR PARENTS IRRESPECTIVE OF WHETHER THEY ARE ALIVE OR DEAD