Your little sister will have your music taste for life because you played it in the car. Legacy starts that small.

Influence over a younger sibling is accidental and nearly total. Whatever is playing in the car becomes the music they love, and opinions you toss out without thinking become their first set of opinions, because you are the closest available model of being slightly grown up. None of it needs any intention from you.

Decide what you want to be handing over this week, since you are handing something over regardless. Play her something good. Say the generous thing about a person rather than the sharp one, because that gets copied just as fast.