The act of havign sex with every member in your family, within a 24 hour timeframe. Is punishable by face transplant. However, if it is proven that all were not within the 24 hours, it is not constituted as Ribery. Lord Geo III was famously hung for Ribery, until it transpired that he actually had sex with his father AFTER 24 hours had passed, since he had sex with his brother.
Alan: Dude you're addicted to Ribery
Vinny: I know, don't tell anyone plz