On August 29th, 2017 he was my 21st great grandfather and believe me I bragged all over Facebook. Of course some people laughed, but since Geni had connected us, it didn't matter. In my mind it was absolutely true.
Today is August 30th, 2020 Geni says "@Alfonso XI the Just, King of Castile and León is your 10th great grandfather's wife's 9th great grandfather."
What this is really telling me is that nothing passed what I absolutely know to be true will be necessarily true. And why is that? Because mistakes are eventually caught, and corrected even if 1 day or 100 years go by - as this is a work in progress. Who knows, maybe when I look at this profile next year on August 29th, 2021, he will once again be my 21st great grandfather.