Incest among adults is legal in New Jersey. No wonder I hate that state. There is something creepy about a state which allows a sin recognized from the beginnings of written history as a great evil against nature.
Incest is one of the gravest of sins. It violates both natural law and good civil law, reducing men and women to sexual objects, undermining sacred relationships.
Incest, like abortion and homosexual acts, is intrinsically evil.
Here is the CCC on incest.
2388 Incest designates intimate relations between relatives or in-laws within a degree that prohibits marriage between them.181 St. Paul stigmatizes this especially grave offense: "It is actually reported that there is immorality among you . . . for a man is living with his father's wife. . . . In the name of the Lord Jesus . . . you are to deliver this man to Satan for the destruction of the flesh. . . . "182 Incest corrupts family relationships and marks a regression toward animality.
2389 Connected to incest is any sexual abuse perpetrated by adults on children or adolescents entrusted to their care. The offense is compounded by the scandalous harm done to the physical and moral integrity of the young, who will remain scarred by it all their lives; and the violation of responsibility for their upbringing.
God will not ignore the gross disobedience of His Will for men and women much longer.