When a persons departed forefathers / ancestors have not attained peace due to lack of religious rituals at the time of their death, a "Dosha" develops into ones Horoscope which is known as "Pitra Dosha”.
In any native's chart, the remaining seven houses are in the clutches of Rahu and Ketu is called Kalasarpa dosha.
The effect of Rudrabhishek is, it creates positive energy and removes negative vibrations. The main thing is the vibration, that is it.
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