Mary Jane Sweeney is the younger sister of Sydney Sweeney, she's not exactly in the spotlight but she's certainly not out of it. When shes offered a part in euphoria season 2 as Fayes younger sister, Dawn she decides to take it. This leads to her meeting the actor of ashtray over time she becomes close with him and all of the cast. Mary Jane is also ironically known for always wearing Mary Jane heels on and off the show.