Megan McCallister is Kevin's older sister and very protective of him. She is not nice to him at all. Like everyone else in the McCallister family, she shows disrespect for Kevin, however she is very up-front about it, calling him names for no apparent reason when he asks for her help. But does show some Respect and pity for Kevin when the rest of the family (except Kate) is in Peter's brother's place in Paris
Megan is portrayed by Hillary Wolf in Home Alone and Home Alone Two:Lost in New York, and Chealsea Russo in Home Alone 4: Taking Back the House.
Megan is first seen when Kevin asks Jeff to help him pack his suitcase, who, like Megan, tells him "tough". She goes on to say: "What was I supposed to do, shake his hand and say, 'congratulations, you're an idiot?' He's completely helpless!"
Later in the film, she shows some sign of caring for her little brother, as she asks Buzz how he isn't worried about Kevin, saying that she is very worried. Once again, quoting that Kevin is helpless.
At the end of the movie, she, with the rest of the McCallister family, is very impressed when Kevin tells them that he had been shopping by himself. She is never shown talking with Kevin, but it is assumed they reconcile.