Canon 808

1. In the direct line of consanguinity marriage is invalid between all ancestors and descendants. 2. In a collateral line

of consanguinity, marriage is invalid up to and including the

fourth degree. 3. Marriage is never permitted if there is any

doubt whether the parties are related through consanguinity in

any degree of the direct line or in the second degree of the collateral line. 4. The impediment of consanguinity is not multiplied.