lol already have it.
Do take issue with one thing, the incest part of the app is part of a longstanding joke in Iceland and urban legend. What the app is and is from is the online database of Iceland's geneology, which has no equal.
People are complete nerds when it comes to this history, and this app was a way to bring the online database so people could more easily look up friends, co-workers, etc..
The title of that article is so absurd, and its obviously not written with any journalistic seriousness as it gets the premise completely wrong. But then again the app was made with a sense of humour about this long standing joke in Iceland, it would be hard for a foreigner to get it.
Just for fun I quickly went back on of family trees for myself, here's the oldest relative I could find. Which btw you can read about in the Sagas