TIL that Jack Nicholson grew up believing his biological mother was his sister, and his biological grandmother was his mother. He found out the truth at 37 years old - when both of them had passed ...

Jack Nicholson realized his mother June was actually his sister when a ‘Time’ magazine researcher contacted him during the fact-checking process ahead of a profile timed to the release of 1974’s ‘Chinatown.’ His sister, June, was actually his mother, and his mother, Ethel May, was actually his grandmother.