Colin Creevey (a Muggle-born) has a brother who is also a Muggle-born. How common is this and how quickly would the magical ancestry show in a Muggle family?

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    Do you mean "How common are wizards/witches born into muggles families"? – doctordonna Jan 16 '18 at 6:56
  • @doctordonna yes. – jessicat Jan 16 '18 at 7:04
  • Someone in their (muggle-born's) ancestry must have had magical abilities. And the gene appears unexpectedly in some (much later) generation. I read J.K Rowling mention this somewhere but I am unable to find that source! :/ – dobby Jan 16 '18 at 7:15
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    "Muggle-born" is the official term for wizards born to two muggle parents, @doctordonna. I've not rolled back the edit just yet, but I suggest you do, jessicat – Edlothiad Jan 16 '18 at 7:19
  • @Edlothiad Honestly, my response just proves that I should not be editing so late at night. – doctordonna Jan 16 '18 at 7:26

Taken off Harry Potter wikia in reference to J.K. Rowling and the Live Chat, Bloomsbury.com, July 30, 2007 (2.00-3.00pm BST):

Muggle-born witches and wizards are descended from Squibs who married Muggles: the magical ability unexpectedly resurfaces after many generations.

Here is another forum discussion on the topic that elaborates more on the theory of magical genetics

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    yes, but how common is it for the magic to resurface? Colin Creevey and his brother were both magical but Lily Evans was magical where her sister was not. How common is it for both children to be magical? – jessicat Jan 16 '18 at 7:30
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    If JK Rowling ever expanded on her answer above, I haven't found it yet. – doctordonna Jan 16 '18 at 7:38
  • @jessicat as often as squibs marry muggles, and as often as the genes resurface. Being a squib wasn't good, so you can assume that quite a few squibs married muggles to get away from the wizard community. – marcellothearcane Jan 20 '18 at 10:09

I found a list of known Muggle-borns from Hogwarts and the Creevey brothers were the only siblings. I think it is highly unlikely that having more than one wizard in a Muggle family is common. Think of Lily and Petunia, or Dean Thomas and his sisters. Hermione was even supposed to have a Muggle little sister, but J.K. Rowling cut her out. So I am concluding that although descendants of Squibs will eventually have magic, it rarely happens in the same generation.

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