If the post-death rites of those who have had an unnatural death or have committed suicide have not been done, and as a result, they continue to remain in the corpse state, then the subtle-body does not gain momentum and consequently it keeps wandering. Such a subtle-body prevents procreation in its descendants and also torments them in some way or the other. To provide momentum to such a subtle-body, the rite of Narayanbali should be performed.
Ideal locations for having the Shraadh or Narayan Nagbali Poojan conducted are Gaya (Bihar) for Father, Mehsana (Gujarat) for Mother and Chanod (Gujarat) for all others, which could be son, daughter or any other relatives. While the Narayan Nagbali Pooja renders peace to the soul of the departed, it also reduces grief among relatives.