Some purohits (generally Iyer vadyars ) say that regular tarpanams are to be performed only after first anniversary of death or tarpanams are to be started from punya kalams. However once sapindkaranam has been completed, the dharsa/sangramana tarpanams should be performed.
Further some say that the it is enough if the first son alone performs the tarpanams. It is not correct.

Dear you, Thanks for Visiting Brahmins Net!
JaiHind! Feel free to post whatever you think useful, legal or humer! Click here to Invite Friends