Talk:A Canterlot Wedding - Part 1/@comment-122.108.147.3-20120325080738/@comment-4917817-20120325114351

so if she's blueblood's sister, then how come blueblood isn't an alicorn? Or did Luna have some kind of fetal mutation?

Or they have that neglected sister that they ignore and is a unicorn, which is blueblood's mother.