Talk:Twilight's Kingdom - Part 2/@comment-26267966-20140706143448/@comment-24908786-20140707120737

Yeah, Shadowflicker. Cadance is Twilight's sister-in-law, and Celestia and Luna are Twilight's aunts-in-law due to Shining Armor's marriage to Cadance. That makes the Princesses family, either by their royal status or by normal circumstances with marriage.

That is why I consider all four Princesses family, and how it would have made Twilight's decision to surrender the Princesses' Alicorn magic, hers included, for the lives of her friends that much harder if Lord Tirek has added the other Princesses to the deal, offering the lives of Twilight's family as well in exchange for their magic.