What is Pitru Shraapa?
Pitru Shraapa ("curse of the ancestors") is read when the 9th house of father, fortune and ancestral dharma, and the Sun (the karaka of the father and forefathers) are afflicted by Rahu, Ketu or Saturn. It is treated as carried-over ancestral karma — the unfulfilled duties of the departed — pacified by Shraddha, Tarpan and the rites of Pitru Paksha.