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Writing an article (or book) in somebody else's name is called "ghostwriting". Typically ghost writers agree under contract to remain anonymous. If you have no such agreement with your sister, and...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/32279 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/32279 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Writing an article (or book) in somebody else's name is called "ghostwriting". Typically ghost writers agree under contract to remain anonymous. If you have no such agreement with your sister, and your sister will not get into any trouble if anybody learns she did not write the articles herself (and they may, once you start making it public by telling others about it), then I would just create a section of your portfolio and label it "Ghostwritten Works". Anybody hiring a writer will understand why your sister's byline is on them. And if they ask about that, explain that is the nature of ghostwriting, you let someone else take the credit (usually for pay).