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In Order of the Phoenix, Sirius confesses he is related to the Weasleys, and that all Pureblood families are related to one another. I was thinking about this, and realized that James Potter was from a Pureblood family.

Who is Harry related to, and does he end up married to his 4th cousin twice removed?

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marked as duplicate by ibid, Wad Cheber, aramis, Null Mar 3 at 5:16

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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well on the harry potter wiki i looks like harry has at least one potter ancestor that was a black. – Himarm Mar 2 at 16:25
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@Himarm The term is Black British, please. /s – TenthJustice Mar 2 at 16:27
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If you're going to change the question that drastically after it already got a great answer, then it would probably be best to just accept it and ask a new question. (You get more rep, and we avoid well-researched answers becoming irrelevant. – ibid Mar 3 at 1:24
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This should be a new question, not an edit that invalidates existing answers. – CreationEdge Mar 3 at 2:32
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@Janus I disagree. The accepted answer currently focuses on just analyzing a single relationship, trying to find its connection. It's a good answer, but essentially incomplete. They shouldn't have to edit to address the new question completely. A new question and answer hurts nothing, and gives everyone a chance to earn more rep at minimum. – CreationEdge Mar 3 at 3:48
up vote 24 down vote accepted

We don't know. Sirius correctly notes that all Wizarding families are related, so he is almost certainly related to every other non-Muggle-born in the series. Harry is therefore almost guaranteed to be related to Ginny, but only in the same way that all Britons are descendants of Charlemagne.

The furthest back in Harry's Wizarding blood we know about were his grandparents, Euphemia and Fleamont Potter, and his great-grandfather Henry Potter. Rowling never gives Euphemia and Henry's wife's maiden names, although both were presumably pure-blood witches since James was considered pure-blooded. So we know Harry's relations to fellow wizards could be relatively recent, but have no idea who they would be.

There is a Charlus Potter listed on the Black Family tree, who had a son with Dorea Black (1920-1977). Before Pottermore, people thought he was Harry's grandfather. If that had been true, Harry would be relatively closely related to Ginny, but Pottermore put a kibosh on that.

If Charlus only had a son, that would mean that the son and his grandchildren's last name would be Potter. Given the timeline, that would mean it's very, very unlikely that any living witches and wizards who are descendants of this branch of the Potters, since no one ever really mentions or brings up the Sacksville-Potters.

The absolute closest Harry could be related to another character is as a second cousin, if either Euphemia or Fleamont had siblings. So the good news is that at the very least, Harry's marriage is legal.

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Why wouldn't it be legal? Even first cousins can marry in the UK, and our info on pureblood families indicates that Wizarding law is likely the same. – CreationEdge Mar 2 at 17:56
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+1 for Sackville-Potters! – ThruGog Mar 2 at 22:01
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Well, technically, the furthest back we know about is Linfred, in the 12th century. Henry is only the furthest back we have an unbroken line of named wizards (presuming here that the Potter name, like most English names up until the 20th century was carried only through the male line). – Janus Bahs Jacquet Mar 2 at 23:10

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