[quote="Regina_Love, post:5, topic:315736"]
The Church assumes all marriages she has witnessed to be valid. To be rendered invalid, it would have to be proven to the Church tribunal that it lacked validity, and they would have to render that decision. Otherwise it is still valid in the eyes of the Church.
Biologically speaking it is not generally a problem that they would share some genetic traits or dispositions. It doesn't usually become a problem unless they repeatedly inbred for several generations.
They entered into marital union in good faith, ignorant of any inpediments. The Church acted in good faith. I see no reason they should seek to end the union.
This sounds reasonable. However.....
[quote="1ke, post:7, topic:315736"]
Under the current Code of Canon Law, consanguinity in the second degree is an impediment to valid marriage that cannot be dispensed:
Can. 1091 §1. In the direct line of consanguinity marriage is invalid between all ancestors and descendants, both legitimate and natural.
§2. In the collateral line marriage is invalid up to and including the fourth degree.
Can. 1078 §1. The local ordinary can dispense his own subjects residing anywhere and all actually present in his own territory from all impediments of ecclesiastical law except those whose dispensation is reserved to the Apostolic See.
§3. A dispensation is never given from the impediment of consanguinity in the direct line or in the second degree of the collateral line.
Canon Law be Canon Law.
Which is why I posed the question.