For propitiating your ancestors, conduct havans on amavasya of pitr paksh (Sep 23) to avoid pitr dosh. For chant, contact 9999567895 http://www.dhyanfoundation.com/shradh.php The soul incarnates into a physical body, which is made up of the five elements in various permutations and combinations; Reincarnating birth after birth depending on the kind of karmas , which one does in a lifetime. There are certain souls who don't reincarnate, either because they are finished with their karmic cycle of bhu lok (the prithvi lok ) or because they are stuck in a different dimension of existence and are unable to manifest in the human body, as their karmic balance is not sufficient to entitle them for a human birth, these souls either remain suspended as energies and are called ghosts and spirits or they go to a different dimension of existence called the pitr lok or the lok of the ancestors. Whatever...