Don't know about that, but do know that our direction can change through free will. Due to poor choices an ancestor has made, we can have "curses" or predispositions in our dna or family line ("I will visit the sins of the fathers to the third and fourth generation"). When you find out it's there ("You'll know the truth and the truth will make you free") and take action through repentance ("He is faithful and just to forgive us our sins") it is reversed, taken out, cancelled. Same thing with our own choices; brings good or bad into our family line; has to be rooted out & dealt with ("Work out your own salvation with fear and trembling"). "Sin" (choices that open us up to -- give permission for -- demonic interference) have noticeable consequences. Witchcraft santeria, voodoo, etc) is a huge one; causes confusion from the "dark cloud" over them; and it can come from someone in their direct family doing that.