Rex Alley (technically Rex McFly due to being Jesse McFly's half-brother) is an aspiring actor. He has a wild side and a four-year old daughter named Lucy, who usually lives in France with her mother. Rex plays the bagpipes in a band and is a love interest for both Heather Montoya and her daughter Ann. He believes Ann to be Marie Duncan, as she used Marie's name when introducing herself. To keep the lie going, Ann pretends to be an expert on and the mind behind John and Marie's software, FakeBlock, a woodblock-playing app she briefly talked with John about. Upon learning Heather was the other woman, Ann punched her in the face.