My younger sister and I go to the same school. The problem: She copies my style! I put a lot of thought into the way I dress, and it bugs me to see a copycat come down the stairs every morning. My mom won’t get involved. Will you?   —Jilly

I'm an older brother, so I get your frustration, Jilly. Look at it this way: Your younger sister admires you and may not have as much confidence in her fashion sense. Why not style her for a week? Help her come up with her own look and she may back off yours.

—Adapted from “Social Q’s” in The New York Times Magazine