It is believed that by satisfying our ancestors and forefathers who are no more in this world, we can have blessings for happy and peaceful worldly life. Brahat parashar(BPHS) gives 14 kinds of pitra-dosh, In the vedic astrology Rahu is considered the main cause of these doshas. The dosha created as a result of the bad deeds by our ancestors is called paitrik-dosh or Pitra Dosha.