The movie “What Happened to My Sister?” is not a widely recognized title, so it’s possible that you’re referring to a lesser-known film, a television episode, or there might be a confusion with the title. It’s also possible that you’re thinking of a movie with a similar name or a film that has a plot revolving around a sister’s mysterious circumstances.
If you’re looking for information on a specific movie that involves a sister’s disappearance or a related theme, it would be helpful to have more details. There are several movies with similar themes, such as “My Sister’s Keeper,” which is about a girl who was conceived to help save her older sister who has leukemia, or “In Her Skin,” which is based on the true story of a teenager’s disappearance. Without more context, it’s challenging to provide accurate information about the film you’re referring to.
If you can provide more details about the plot, actors, or even the year it was released, it would be easier to identify the correct movie. Additionally, checking online movie databases like IMDb or using a search engine with any specific details you remember could help you find the movie you’re looking for.