At the age of 37, Jack Nicholson found out that the woman who he thought was his sister was actually his mother.

In 1974, Time magazine researchers learned and informed Nicholson that his "sister" June, was actually his mother. His other "sister" Lorraine, was really his aunt. Of course, Nicholson was shocked and called the event "pretty dramatic", but he wasn't traumatized at all. He felt grateful that it made many things clearer to him, but nothing more. He said "I was pretty well psychologically formed." Both women were already dead at that point, and the actor was 37 years old.

This might be interesting: June, Jack's true mother, was 17 years old, unmarried and uncertain of the father's identity at the time of Nicholson's birth, so her parents agreed to treat Jack as their own child and never reveal to him his true parentage.

Jack Nicholson became a well-known actor and filmmaker, most famous for such works as The Shining, Batman and One Flew Over the Cuckoo's Nest.