"Of Hemingway’s three children, Patrick came closest to simulating, though hardly emulating, his father...."

"Hemingway’s first son, Jack, was an avid fly fisherman who fished in Europe between battles in World War II. He had difficulty finding a postwar career until he became Idaho’s fish and game commissioner in the 1970s. He died in 2000. Hemingway’s third child, Gloria Hemingway, was a physician who struggled with alcohol abuse. She wrote a memoir, 'Papa' (1976), before undergoing transition surgery later in life. She died in 2001."

From "Patrick Hemingway, Ernest’s Devoted Second Son, Is Dead at 97/Inspired by his parents’ travels, he spent much of his life in Africa and helped complete his father’s safari memoir. He also published a volume of father-son letters. He was Ernest Hemingway’s last surviving child" (NYT).

Transition surgery? I clicked on "She died in 2001" and got to the obituary "Gregory H. Hemingway, 69; Wrote a Memoir Called 'Papa.'" Excerpt:

Mr. Hemingway, who lived in Coconut Grove, Fla., had been arrested in nearby Key Biscayne for indecent exposure and resisting arrest without violence.... He was found dead in his cell at the Miami-Dade County Women's Detention Center at 5:45 a.m. on Monday, the paper said.

He was in the Women's Detention Center.

According to several news accounts yesterday, Mr. Hemingway often dressed as a woman, and was known among some friends as Gloria. He had undergone a sex change operation, according to Reuters.

Notice the different journalistic convention. The NYT stuck with what is now called a "dead name" and used the masculine pronoun, even for someone who'd had what today's obituary calls "transition surgery." It was "a sex change operation" back then. The NYT, in 2001, continued:

Gregory Hemingway was born in Kansas City, Mo., on Nov. 12, 1931.... Lorian Hemingway said her father had been living in Florida for more than 10 years. He was married four times, she said, but she did not know if he was married when he died. Lorian Hemingway, 49, said she was the oldest of Mr. Hemingway's eight children, all of whom survive him. He is also survived by a brother, Patrick Hemingway, of Bozeman, Mont.

It is Patrick who died 2 days ago.

From the Wikipedia article "Gloria Hemingway":

Throughout her life, Hemingway experienced gender dysphoria and wore women's clothes often, mostly privately and occasionally going out. When Hemingway was 12 years old, Ernest walked in on her dressed in her stepmother Martha Gellhorn's stockings, a near-daily activity at the time, and went berserk. A biographer Hemingway's, Donald Junkins, stated that when Hemingway was 60 years old, she told him that "[she] never got over it: the raging wrath of [her] father." However, a few days after the childhood encounter Ernest counseled "Gigi, we come from a strange tribe, you and I." 

In 1946 Ernest's wife Mary accused the maid of stealing her lingerie, but later discovered the items under 14-year-old Hemingway's mattress. When Ernest rebuked her for stealing from Mary years later, Hemingway responded, "The clothes business is something that I have never been able to control, understand basically very little, and I am terribly ashamed of. I have lied about it before, mainly to people I am fond of, because I was afraid they would not like me as much if they had found out."