Lal Kitab astrology gives lot of importance to Pitri Dosh . Pitra Dosha is not a curse of the Ancestors, but it is a Karmic Debt of the ancestors which the person having Pitra Dosha in his horoscope is supposed to pay.
Since we enjoy the wealth, name and fame earned by our ancestors we are equally liable to suffer their misdeeds too. The dosh created as a result of the bad deeds of our ancestors is pitri-
dosh or pitra-rin. . Pitri rin is different from the ‘pitri-shraap’ or the curse of the ancestors.
Brahat parashar gives 14 kinds of pitra-shrap, Mantreshwar in phal deepika says that rahu in the 5th creates pishach-badha, Gopal Ratnakar calls it sarp-shrap. In the traditional vedic astrology Rahu is considered the main cause of these dosh .
Lal Kitab in its 1952 edition discusses this problem in great detail along with its remedies