Como Bellatrix diz nos comentários, isso é Wizards of Waverly Place: The Movie . Ele estreou no Disney Channel em 2009, então é muito justo chamá-lo de um episódio especial do programa. Aqui estão os detalhes relevantes da trama, até o ponto em que você se lembra:
The Russo family, Alex, Justin, Max, and their parents Jerry and Theresa are preparing for a vacation to the Caribbean. [...] Once in the Caribbean, the family meets a boy working at the hotel that Alex instantly develops a crush on. [...]
Later, after Alex was about to use a spell on her mother to convince her to let Alex hang out with the boy from the hotel, she gets caught, leading up to a heated confrontation with Theresa. Theresa tells Alex she is grounded for two months, which means she is forbidden to use magic and go out on dates or parties, As a result of this Alex, in a fit of rage, wishes that her parents had never met. The smuggled full-wizard wand and spell book, which Alex was holding at the time, grants her wish. As a result, Jerry and Theresa do not remember Justin, Alex, Max, and they don't know each other.
Wikipedia