Ecactly one year ago I puzzled my brain about family relation and the complicated terms which different languages (German : English) use for describing such relation. I understood that pictures may tell more than words ever can, at least when I found explaining graphics instead.
Each time, when I have to explain how we are related - to one of the newly found family members on facebook or elsewhere - I make sure to use the right term by consulting those images.
Nevertheless the procedure is the same everytime. It works the way as, if we were still children using our fingers: Who is Theresa? Oh, she is my grandfather’s brother’s great grandchild. Isn’t she? Let us see?
Guenter Junkers of the Compgen-Association straightforward gave a worthfull hint in Computergenealogie, Magazin für Familienforschung, Heft 3/2010, page 7. He presented information about a sience-based search engine named wolframalpha.com! Ask Wolfram for “grandfather’s brother’s great grandchild”, and he will, at the very beginning, speak to your eyes, which understand immediately:
(Self = Peter, second cousin = Bob, second cousin once removed = Theresa.)
This is not all! Wolfram also knows, that our common ancestor lived three generations back – we see it -, that there is a difference of one generation between Theresa and me. It’s obvious! Consequently she is the younger one.
But now the hit: Following mathematical calculation there pulsate 0,78125 % or 1/128 of our common ancestor’s blood in our veins. What Wolfram does not know, is the distribution of the remaining 99,21875 % of both of us. Link: http://www.wolframalpha.com/inp/?i=grandfather%27s+brother%27s+great+grandchild
We know it!