Does Any Have A List of Champion Siblings?

So I saw a post saying it was confirmed that every champion had a sister. Not sure how accurate that is, but I was curious if anyone had/could make a list of all the champions and their siblings (or the ones you know of). I just find it interesting to know who is related to who.
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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