New App Prevents Icelanders from Sleeping With their Relatives
newsoficeland.com
newsoficeland.com
For Iceland's case as addressed in TFA, that's perhaps a more relevant metric -- that you might end up "crossing" with someone outside of known family, yet who is still closely related enough to present a genetic risk.
I sense a market for a Square-style "DNA chip on a headphone jack" to augment this app. ;-)
Isn't that basically just siblings, and maybe first cousins?
Your fourth cousin might have a copy of the same bad gene as you while your first cousin doesn't.