I really don't know. IS incest illegal in the US?
For 2 adults, it can be illegal in certain jurisdictions but it's mostly a social taboo. I am searching for cases in which incest between adults has been prosecuted. It's considered child abuse if it happens between a child and parent.)
Incest is sexual relations between people classed as being too closely related to marry each other.
- the crime of having sexual intercourse with a parent, child, sibling, or grandchild.
Per Google