Jack Nicholson
Raised by Ethel May and John Nicholson in New Jersey, Jack always believed that these were his parents. When he was 27 years old, a Time reporter interviewed him and revealed that Ethel May and John were not his parents but actually his maternal grandparents. His real mother was who he thought was his sister, June Nicholson. Sadly, all of these people had already passed away and he never learned their story.