The Story: Separated-at-birth twins get married - LONDON (AFP) - Twins who were separated at birth and adopted by different sets of parents later married each other without realising they were brother and sister, a peer has told the House of Lords.

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Title of the film: Mister Sister

Tagline: This time, her baby-daddy is her daddy’s baby.

Starring: Jake and Maggie Gyllenhaal

The Plot: Jenny (Maggie Gyllenhaal) works in a coffee shop in Central London. Her adoptive parents (Mark Hamill and Carrie Fischer) keep posting her information onto online dating sites.

Peter (Jake Gyllenhaal) is an orphaned dancer from Leeds who has come to London to take a chorus position in Billy Elliott.

When a blind-date at the theater goes bad, Peter saves Jenny and the two fall in love, eventually getting married.

But, when Jenny gets pregnant, a routine check-up reveals something unexpected.

The Twist: Two words: “incest baby.”

Why it will work: All the drama that an incest romantic comedy (starring siblings) would drum up in the press.