Method of Esaal-e-thawaab – What must I do?

Q: Our forefathers have done a lot of good to us. What must I do if  my heart desires that I carry out some action by means of which the punishment or difficulty they are experiencing in the grave (may
Allah forbid) is uplifted or lightened?
A: There are numerous actions that one can do. Once someone had posed a similar question to Nabi صَلَّى اللَّهُ عَلَيْهِ وَسَلَّم and he suggested the digging of a
well, for as long as the creation continues benefiting from the well,one will continuously receive thawaab (reward).