regula_bloodline_addition_effect = {
    add_trait = $BLOODLINE$   
    every_child = { # Sons/Daughters
        add_trait = $BLOODLINE$
        every_child = { # Grandsons/Grandaughters
            add_trait = $BLOODLINE$
            every_child = { # Great-grandkids
            add_trait = $BLOODLINE$
            }
        }
    }
}