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fixing an error -- How do I remove a sibling relationship

I have noticed an error on my tree, with nodes I own. I merged two branches as siblings. In have recently learned that they are not siblings, but rather a nephew / uncle. I want to remove the sibling relationship between X and Y, and then set Y as a sibling of the parent of X.  I cannot seem to find a way to do so.  Thanks for any tips.

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