Film where his new wife has to please his brother

I think I can help you with that!

The film that comes to mind is "The Stepfather" (1987) directed by Joseph Ruben. The story revolves around a widowed mother, Susan (Terry Pollio), who marries a charming and charismatic man, Terry (Terry O'Quinn), who seems perfect. However, things take a dark turn when Terry's brother, Mike (Stephen Shellen), becomes increasingly controlling and demanding towards Susan, making her feel uncomfortable and trapped.

As the story unfolds, it becomes clear that Terry's intentions are not as pure as they seemed, and Susan finds herself caught in a web of deceit and manipulation. The film explores themes of gaslighting, emotional abuse, and the complexities of relationships.

Is this the film you were thinking of, or would you like me to suggest more options?