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Movies like Loving Leah (2009)

When Leah's husband Benjamin dies suddenly, Benjamin's brother Jake is stunned to learn he is expected to marry the childless Leah to carry on his brother's name. Jake suggests to Leah that they get married and maintain a secretly platonic relationship. The harder they try to disguise their "pretend" marriage, the more their appreciation for each other's worlds grow, and out of understanding, a real love develops.