Incest is marriage or sexual intercourse with a relative within the prohibited degree of consanguinity. In other words, incest is sexual contact between close blood relatives, including brothers and sisters, parents and children, grandparents and grandchildren, or aunts or uncles with nephews or nieces. Incest is a crime in all states, even if consensual by both parties.
[Last updated in April of 2022 by the Wex Definitions Team]