Something that has been bugging me.

So I watched the last two episodes of Friendship is magic season 2 and I have to ask. If Twilight's Brother, Shining Armor, has married Princess Cadance, which makes her and Twilight sisters in law, does that not mean that Twilight is now a princess?

Other evidence: To add support to this, remember in Season 1, episode three "the ticket master" Rarity mentions and I quote "I would have a wedding befitting of a princess, which is what I would become upon marrying him." Him being prince Blueblood. Now I know that Twilight did not marry Cadance herself, but she is a blood relative of the one who did, which must count for something.