Jack Nicholson was raised believing his mother was his older sister. His actual mother, June, had been 17 and unmarried when he was born, so her parents raised him as their own and kept the secret his entire life. Neither woman ever told him the truth, even on their deathbeds. In 1974, a Time magazine researcher preparing a cover story called Nicholson to verify what they'd uncovered: his 'sister' was actually his biological mother. The timing was surreal. He was promoting Chinatown, a film whose devastating central twist is a character revealing: 'She's my sister AND my daughter.'