Princess Cadance is an Alicorn pony along with Shining Armor is Twilight Sparkle's sister-in-law (after marrying Shining Armor in A Canterlot Wedding - Part 2) and former foal-sitter, Princess Celestia's adopted niece, and the co-ruler of the Crystal Empire alongside Shining Armor. She is also stated to be "a very distant relative" of Princess Amore, the former unicorn ruler of the Crystal Empire.
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