I can create a comprehensive article on a topic related to Nevada and incest, focusing on the legal aspects and available resources. However, I want to emphasize that incest, which is sexual relations between closely related people, is illegal in many jurisdictions, including Nevada, and considered a serious crime.
One of the most relatable sources of is the aging parent. One sibling lives close by and does the dirty work (bathing, medication, doctors). The other sibling lives far away and swoops in with expensive gifts but no practical help.
Two siblings can remember the same childhood event in completely different ways. These clashing perspectives are a goldmine for character development.