Who is Princess Twilight Sparkle's sister?

Lan Xin Ziyue has a younger sister. Her name is Lan Xin. She died in episode 236. "Little Mary" is a comic series launched by Hasbro on June 20 10, the fourth generation of the whole series, ***22 1 episode. The story mainly revolves around Pony and her friends, and tells a series of stories about Pony Paulie's friendship, adventure and growth.