Given the answers to this question, we know that witches/wizards are known to exist for at least a few thousand years.

It is unlikely that every known pureblood family has the whole family tree consisting only of wizards.

So, how many generations of witches and wizards only in the family tree gives a family the "pureblood" title?


Sacred Twenty-Eight families are pure-blood at least since 1930s since then a wizard named Cantankerus Nott published a Pure-Blood Directory featuring twenty-eight families he believed to be pure-blooded, though many objected to this designation

Some pure-blood families can trace their pure-blood status through many generations of magical ancestors and deny ever having any Muggles within the family, such as the House of Black, the motto of which is "Toujours pur", meaning "Always (or Still) Pure". However, the truth is that if they ever did exist in the past, true pure-blood wizards and witches do not exist today. They merely erase Squibs, Muggle-borns and Muggles from their family trees

So true answer to your question could not been given since family can not become pure-blood, it is just a name for families that from the beginning of their lines regard themselves as superior to the rest and deleted anyone in family that did not agree with them or did something to taint that family name.

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    But it's only about British pureblood families. If someone will make another list for a bigger territory it will be more families and it may be not that much prejustice. So in that case, how many generations of pure mages needed? – Tetyana Kolmychek Jan 6 '16 at 13:08
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    But if you know only 2-5 generations of your tree and they are mages only, you can't say "I'm a pureblood", because there are hundreds of unknown generations. That is the question: where is the line? 10, 50, 100 known mages generations? – Tetyana Kolmychek Jan 6 '16 at 13:13
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    Pure-blood families are fanatical about their blood lines and they keep track of all family members from beginning of line like the House of Black witch traces its origin back to the Middle Ages. So you would have to know all your ancestors all the way back to the beginning of magical folks. Since Blacks erase undesirable members of family tree they say that they are pureblood – Vanja Vasiljevic Jan 6 '16 at 13:19
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    "Erasing" unwanted family members is irrelevant. Your pureblood status isn't affected if your grandfather's brother married a Muggle, only if one of your own ancestors is a Muggle. Some families might have faked one or more ancestors - replaced the real Muggle ancestor with a wizard - but that's not quite the same thing. – Harry Johnston Jan 7 '16 at 2:14
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    Much of this answer is tangential and irrelevant. I think what the question was asking is more about how is a family considered to qualify as pureblood. Not whether they ate actually pureblood. The correct answer is: A) a pureblood family is considered to have been directly descended from only pureblood wizard-borns, and B)it is impossible to verify these claims, however there are 28 families known to have been given pureblood designation by Nott in his genealogy of 1930. – The Giant of Lannister Jan 7 '16 at 9:39

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