That which comes in a line. Lineal consanguinity is that which subsists between persons, one of whom is descended in a direct line from the other. Lineal descent, is that which takes place among lineal kindred. That which comes in a line; especially a direct line, as from father to son. Collateral relationship is not called “lineal,” though the expression “collateral line,” is not unusual. Lineal consanguinity. That kind of consanguinity which subsists between persons of whom one is descended in a direct line from the other; as between a particular person and his father, grandfather, great grandfather, and so upward, in the direct ascending line; or between the same person and his son, grandson, great grandson, and so downwards in the direct descending line.