In June 1974 the mystery of Jack Nicholson's birth came to light. Jack's "sister" June was in fact Jack's mother. Jack, born on 22 April 1937, had been the illegitimate child of 17-year-old June Nicholson. Nicholson had spent his life up to age 37 assuming that his biological mother, June, was his sister, and that his maternal grandmother, Ethel May, was his mother. Even on their deathbeds, neither June nor Ethel May had offered up the truth.