You should always go to important family events.
Cathy has tickets to see a movie at the same time as her brother Mike's 10th birthday party.
Cathy wants to see the movie.
Cathy exchanges her tickets for a different showtime and goes to the party.
Cathy goes to the movie instead of going to the party.
Mike is glad that he can spend time with Cathy on his birthday.
Mike is devastated that his older sister couldn't be at his party.