Mack's twin sister ( Teen Beach movie)
Mack, or MacKenzie has a twin sister named Chrissie. And what if before Mack started dating Brady, Chrissie liked Brady. There are some differences between them like their hair. Chrissie's hair is longer than Mack's and Chrissie has blonde highlights .That's actually the only difference between them except Chrissie loves Wet Side Story and Mack hates it.