Raine is the youngest child of Twilight & Sunny. She's a little bratty and uptight mainly cause of her high status
She's best friends with Pinkie's son Acia, they spend almost all of their free time together and are inseparable. Besides that Raine isn't very close to Twilight or her brother Dusky, she's more close with her father Sunny then the rest of the family
Despite their relationships not being the best she still loves her family no matter what and can't wait until she gets the chance to take the throne as ruler of Equestria