211.1 After the death of Prince Philip, I re-read my post from ten years ago, Related How Again #16: Royal Action! (here) I corrected a couple of typos, made a few minor edits, and re-checked the math, just to be on the safe side. It has proven to be one of my most popular posts, quoted as a source on several other websites…one even “borrows” my charts, but then that’s the way of the net, no?
211.2 In it I cover 5 ways that Elizabeth II and Philip are blood relatives…3 through Queen Victoria, one through Christian IX of Denmark, and one through neither. I opined that there were likely more ways going further back, and I was right. In this post we’ll check 6 more ways: 2 through Christian, one through his wife Louise of Hesse-Kassel, and 3 through both of them, as they were related to each other in several ways. Christian and Louise were mostly German, although both were also great great grandchildren of George II, and in fact Christian was in 2 ways, as 2 of his grandparents were 1st cousins.
211.3 But to review the first 5 ways….
211.4 3rd cousins…since both Elizabeth and Philip are great great grandchildren of Queen Victoria and Prince Albert. And as such, Philip was himself in the line of succession, albeit way down. The last time a complete list was compiled was 10 years ago, and he was around #550.
211.5 2nd cousins once removed…since Philip and Elizabeth’s father were the great grandchildren of Christian IX and Louise. So this is actually their closest relationship, but the one that’s alway quoted is 3rd cousins, since that line is more significant: it’s the British royal line, and it’s the reason Elizabeth sits on the throne today. Together, these 2 relationships amount to about three quarters of their total coefficient of relationship.
211.6 double 5th cousins…since Victoria and Albert were themselves 1st cousins.
211.7 4th cousins…since both Elizabeth and Philip were great great great grandchildren of Ludwig Von Wurtenberg.
211.8 4th cousins once removed…since Elizabeth and Philip’s mother were great great great grandchildren of George III. All together, these 5 ways amount to a coefficient of relationship of 2.75%. The remaining 6 ways add just .33%.
211.9 And of those 6, none are through Victoria. Now you might be surprised to learn that Elizabeth’s pedigree (direct ancestors, meaning parents, grandparents, great grandparents, etc) is only completely known through 5 generations, counting her parents as the first generation. (I say that because one popular system would count Elizabeth herself as generation 1, and her parents then as generation 2.) There are 10 unknowns in the 6th generation, that is, nobody knows the parents of 5 of her great great great grandparents (that’s 5 out of 32.) Mind you, these unknowns are NOT on the royal side.

211.10 At any event, I believe these 11 relationships are all there are going back through 8 generations, barring the unknowns, which of course tend to add up. You’ll notice on the left of Chart 761 that I have not filled in any names, as I normally would. I just felt like working with a more streamlined tree this time. I know the names, and if you need to know, send me a comment. I have marked Elizabeth and Philip as E and P…Christian is C…and at the top is G, who is George II, the grandfather of George III, monarch during the American Revolution, to give you a chronological context. And the green line near the top is of no significance, just colored differently since it crosses a black line.
211.11 So how do you evaluate a tangle like this? Here’s a “shocking trick,” as internet click-bait ads like to put it. If you and I shared a common great grandparent, how are we related? Well, we could be siblings, half-siblings, 1st cousins, half-1st cousins, 2nd cousins, or half-2nd cousins. Sharing a great grandparent doesn’t tell you anything specific. But what if one of my grandparents and one of your grandparents were siblings? Then we could only be 2nd cousins and nothing else. So the answer is, look for siblings and work your way down from there. And as we see on the right of Chart 761, there are 5 sets of siblings to consider, one set of which are half-siblings (the dark green).

211.12 You’ll notice in Chart 762 that 2 of those sibling pairs and the half-sibling pair lead down to Louise on one side and Christian IX on the other side, and they were married. That means that their descendants have a double relationship to each other. Why is that?

211.13 Well, the top tree in Chart 763 is what it would look like if Louise and Christian were not married. They are 3rd cousins, being the great great grandchildren of George II, and their descendants follow down the “cousin line”…their offspring are 4th cousins, their grandchildren are 5th cousins, etc.
211.14 But the bottom 2 trees in Chart 763 show them married, and so the cousin lines of each can go in one of 2 different directions. For example, if they have sons A and B, these sons are related according to how A’s father is related to B’s mother, and how A’s mother is related to B’s father. These relationships are represented by 4 different sets of inherited genes, and must be compared 2 by 2. Thus the cousin line relationships are doubled.

211.15 In Chart 764 there are three more ways Elizabeth and Philip are related, but these do not depend on Louise and Christian being married…the lines of descent in each case go through either Louise or Christian, but not both, and so the relationships between the descendants are single not double.
211.16 Totaling up all 11 relationships, Elizabeth and Philip are related by 3.08%. 2nd cousins are related by 3.125%, so they are a bit more distant that 2nd cousins. Half-2nd cousins are 1.56% and 3rd cousins are .78%, so saying that they are the equivalent of 2nd cousins is a very close approximation and thus a reasonable simplification, bearing in mind that they are not literally 2nd cousins. You have to be 2nd cousins to be 2nd cousins, math or no math…
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211.17 This just in….as we were about to “go to press,” I discovered that Victoria and Albert, besides being 1st cousins, were also 3rd cousins once removed. Victoria’s mother was the sister of Albert’s father Ernst, and Ernst was his wife’s 2nd cousin once removed, as a pair of his great grandparents were also her mother’s great grandparents. Trust me, it checks…and through this relationship Elizabeth and Philip were double 7th cousins once removed, adding another .003% to their total degree of kinship. As you might expect, the article I read said Victoria and Albert were related in other ways further back. These weren’t specified…and will for now remain a project for another day.
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