Answer by Suminda Sirinath S. Dharmasena for What would Buddha advise to farewell when one of your parents died?

You can do transfer of merit.

More on this see:

• How can merit be transferred?
• Transfering merits
• Sharing merit in Theravada Buddhism
• Actions taken to transfer merit
• Does Theravada believe in feeding food to hungry ghosts?

Also you can do a:

• offering of cloths to the monks in memory of the dead (monks cloths were initially made of the cloth used to wrap the dead bodies)
• organise a dhamma talk for the benefit of the dead (generally the night before the almsgiving mentioned below)
• organise an almsgiving for the benefit of the dead (generally at 7 days, 3 months, then annually)

Some of these are covered in: Buddhist Ceremonies and Rituals of Sri Lanka by A.G.S. Kariyawasam

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