Mary-Kate and Ashley Olsen's little sister Elizabeth Olsen has been rising in Hollywood this past year, with a new scary movie "Silent House" in theaters now.

However, she's not the only celeb sibling who has tried making a name for herself.

James Franco's brother Dave has graced our TV screens, Chris Farley's brother Kevin carries on the family tradition and keeps us laughing, and Scarlett Johansson's twin brother Hunter is on a mission to help save the world.

Click "Launch Gallery" below to see these and other lesser-known celeb siblings, and what they've been working on!