Gregory Hemingway

Gregory Hancock Hemingway (November 12, 1931 – October 1, 2001), also known as Gigi, Gig, and Gloria Hemingway, was the third and youngest child of author Ernest Hemingway, and second son of Pauline Pfeiffer. He became a physician and authored a memoir of life with his father. Most of his life was marked by struggles with addiction (which eventually cost him his medical license), estrangement from his father, and uncertainty about his own gender identity.

Gregory Hemingway in "Cayos in the Stream"
Ernest Hemingway took his sons Gigi and Patrick with him on his U-boat hunts off the coast of Cuba in 1942. While they weren't there when Hemingway finally found a U-boat, the fact that they could have been and would have been at risk was something Hemingway's wife, Marth Gellhorn used against him when she decided to leave.

Hemingway had private concerns about Gigi; the boy could be a little devil, and Hemingway was worried he'd turn out to be a homosexual.