Six-year-old Luke astonished his mother, Amy, by claiming he found his twin sister, Luna, at school. Despite Amy’s confusion, Luke insisted they shared a birthday and looked alike. Intrigued, Amy decided to arrange a playdate with Luna.

Luke showed Amy a class photo, pointing out Luna, who indeed resembled him. Amy arranged to meet Luna’s mother, Penelope, and set up a playdate. When Luna and Penelope arrived, Jeff, Amy’s husband, went pale seeing them. Luna called Jeff “Daddy,” revealing an affair Jeff had years ago, resulting in Luna’s birth.

Jeff confessed to Amy about the affair and meeting Luna secretly. Penelope explained that Jeff knew little about Luna and had no idea they attended the same school. Amy, hurt and confused, decided to attend couples counseling with Jeff for the sake of their son, Luke.