Studying Incest
- https://blog.ipleaders.in/incest-legality/
- https://www.quora.com/Why-is-incest-considered-a-crime-and-is-punishable-by-law
- https://www.reddit.com/r/changemyview/comments/7jrah3/cmv_incest_should_be_legal/
Wikipedia based
General Understanding
It depends on cultural norms.
- Arabia defines incest only between siblings
- West has it only upto twice-removed people
- Jews only have in diagonally twice-removed