We know of at least one Muggle-born magic user who had a sibling (Lily Evans) - and her sister was a Muggle.

Did JKR books contain at least one case of Muggle-born siblings BOTH of whom were wizards/witches?

(100% Muggle-born; half-bloods don't count)

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    This is related to another Q I asked, since I am researching heritability of magic in Potterverse. Dec 17 '13 at 16:38

Colin Creevey... and his brother Dennis.

In the Chamber of Secrets Colin unabashedly shares his Muggle-bornness:

It’s amazing here, isn’t it? I never knew all the odd stuff I could do was magic till I got the letter from Hogwarts. My dad’s a milkman, he couldn’t believe it either. So I’m taking loads of pictures to send home to him.

Dennis is introduced in The Goblet of Fire:

It was Colin Creevey, a third year to whom Harry was something of a hero.
“Hi, Colin,” said Harry warily.
“Harry, guess what? Guess what, Harry? My brother’s starting! My brother Dennis!”
“Er – good," said Harry.

From HP Wiki:

Colin Creevey grew up in an ordinary Muggle family. He was the son of a milkman and was amazed to find out he was a wizard attending Hogwarts. Colin was continually awestruck at everything to do with the wizarding world. Colin had a younger brother named Dennis, who was also a wizard, an unusual thing to occur for two magical offspring to come from Muggle parents.

  • Oh! I forgot they were muggle-born! Drop in a quote showing the muggle-bornness and I'll accept! Dec 17 '13 at 16:40
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    @DVK on the very first page we meet him, in Chamber ch. 6, Colin says “I never knew all the odd stuff I could do was magic till I got the letter from Hogwarts. My dad's a milkman, he couldn't believe it either.”
    – b_jonas
    Dec 17 '13 at 20:21

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