In 1981, an "incest exception" law was voted in many states in the USA.
That means that people who commited incest got off with a lighter sentence (like 10 DAYS in prison), if any at all, compared to a person who sexually abuses another's child.
Alison Arngrim, best known as Nellie in the Little House on the Prairie, fought against this absurd law and she won. 💪