Types of dutifulness performed for the deceased

Question:
May Allah reward you. He says: Honorable Shaykh, what are the best types of dutifulness toward a deceased parent? Are there specific acts of worship for being dutiful to the deceased, other than Hajj and 'Umrah, for example? Also, regarding charity, is it better to give it immediately or delay it a little, such as building mosques?

Answer:
The types of dutifulness toward a deceased parent after his death are many. First is to hasten to carry out his bequest if it is within the limits of the Shari'ah. Second is to pay off his debts; indeed, paying off debts takes precedence over the bequest. One should first hasten to pay off the debts he owes to Allah or to people. Second is the bequest: carrying out his lawful bequest. Third is giving charity on his behalf, giving charity on his behalf from good wealth. Fourth is making du'a' for him, seeking forgiveness for him, and sending blessings upon him.
Fifth is performing Hajj and 'Umrah on his behalf, which includes great reward. Sixth is maintaining family ties with the relatives connected to the parent, those with whom you share a kinship link through the parent; this is part of being dutiful to the parent.
Seventh, among the dutifulness to the deceased, or the dutifulness to the parent after his death, is maintaining his friends who used to be his friends in his lifetime, for being dutiful to the parent includes maintaining his friends. Yes.