25. Lineal consanguinity.-
Lineal consanguinity is that which subsists between two persons, one of whom is descended in a direct line from the other, as between a man and his father, grandfather and great- grandfather, and so upwards in the direct ascending line; or between a man and
his son, grandson, great- grandson and so downwards in the direct descending line.
Every generation constitutes a degree, either ascending or descending.
A person' s father is related to him in the first degree, and so likewise is his son; his grandfather and grandson in the second degree; his great- grandfather and great- grandson in the third degree, and so on.