This is Shane's younger sister, Megan. She was only referred to prior to this. Like her brothers, she excells in something talented.

Pat is an artist.
Shane is a musician.
Megan is a thespian.

Aside from this, she's also the smartest person in the family, that includes her parents and other relatives. This story takes place early year three. Here Megan is 11, while Shane is 18.