Correct.
And from a case in New York in 2014, where a marriage had taken place between an uncle and a niece, it was appealed to a Federal court, who then ASKED THE HIGHEST NEW YORK COURT TO LOOK AT THE ISSUE!
The New York supreme court then reviewed the rulings and decisions and decided the marriage was a true marriage.
Case closed.
Ergo, the Federal government simply has no jurisdiction.
And it is a GRIEVOUS MISTAKE to give them jurisdiction by implication!