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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?

2 Answers 2

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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? Commented Jan 6, 2016 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? Commented Jan 6, 2016 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 Commented Jan 6, 2016 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. Commented Jan 7, 2016 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. Commented Jan 7, 2016 at 9:39
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Once a pureblood marries a half-blood or a muggle-born, there is no way the family can become pureblood again (unless they have siblings or cousins that marry purebloods.) But as an example, Harry is a half-blood, and Ginny is a pureblood. So Half-Blood+Pureblood=Half-blood, seeing as their children are half-blood. If Lily Luna Potter got to marry a pureblood, her children would be half-blood, and even if her children married and had kids with a pureblood their children would still be half-blood. This makes it an endless cycle, and no matter how many pure-bloods a half-blood family marries, they will always be half-bloods.

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    No part of this answer addresses the question of how a family could regain their "pureblood" title
    – Valorum
    Commented Mar 31, 2021 at 16:43
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    @Valorum the last sentence is the answer: if the "purists" think that children of a half-blood are always half-blood, then no matter how many pure-bloods a half-blood family marries, they will always be half-bloods. This implies that the only way to be pureblood is to have only pureblood ancestors.
    – lfurini
    Commented Mar 31, 2021 at 17:33
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    @ava - Which brings us back very neatly to the question originally asked (and not answered) which is how long it takes before people accept them as pure-blooded.
    – Valorum
    Commented Mar 31, 2021 at 20:18
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    This sounds like the one-drop rule from American racism.
    – sjl
    Commented Mar 31, 2021 at 23:16
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    well, the equivalent of racism in the wizarding world is blood-purity
    – ava
    Commented Apr 1, 2021 at 13:19

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