Don't think tracking bloodlines has as much to do with psychic abilities as "resurrecting" or cloning the dead via their DNA and animating via demonic entities. Hence Egyptian obsession with preservation of bodies through coating in gold and/or mummification - awaiting the time when technology could "resurrect" them.
https:// www.theatlantic.com/science/archive/2018/01/hans-jonatan-iceland-genome-reconstructed/550667/