One of the last living family members of Nazi dictator Adolf Hitler was engaged to a Jewish woman, but she broke it off after discovering the family’s secret, sinister history, the German newspaper Bild revealed Tuesday.

It has long been known that Hitler’s last living relatives have been living quiet, unassuming lives on Long Island, New York.

In his first public interview in over a decade, one of these relatives, grandnephew Alexander Stuart-Houston, whose middle name is Adolf, revealed that a family member planned to marry a Jewish girlfriend, but that she called off the engagement. Stuart-Houston did not specify which brother, and did not identify the Jewish fiancee.

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Alexander, 68, is the oldest of three surviving grandsons of Hitler’s half-brother Alois Hitler, who moved to Liverpool with his Irish wife Brigid Dowling in the first decade of the 20th century.

Alois’s son William Hitler was born in 1911 in Liverpool.

In his twenties, with Adolf Hitler’s rise to become chancellor of Germany, William decided to leave Britain for Germany. He was working as a banker in Berlin in 1935.

William was unhappy with the work, and was reportedly shunned by his uncle, so he moved with his family to the United States.

He even enlisted in the US Navy, where he served during World War II.

In 1946, saddled with the most despised name in the world, William Hitler moved his family to a small town on Long Island and changed his name to Hiller, a favorite adopted name for other Hitlers living in postwar Germany. It was later changed again to Stuart-Houston for unclear reasons.

His four sons were Alexander, Brian, Louis and Howard.

Howard was the only one who married and reportedly planned to have children, but he was killed in a car accident in 1989.

All three surviving brothers still live in their small hometown of Patchogue.

The fact that none of the surviving brothers married or had children has raised speculation over the years that they had quietly resolved to remain childless, and thus let the Hitler family line come to a natural end. That was the claim of British journalist David Gardner, who tracked them down in the 1990s, and wrote a book entitled, “The Last of the Hitlers: The Story of Adolf Hitler’s British Nephew and the Amazing Pact to Make Sure His Genes Die Out.”

“They didn’t sign a pact, but what they did is, they talked amongst themselves, talked about the burden they’ve had in the background of their lives, and decided that none of them would marry, none of them would have children. And that’s…a pact they’ve kept to this day,” Gardner claimed.

Alexander denied knowing of such a pact in a 2002 interview with Gardner, but said his brothers may have made one that did not involve him. Sixteen years later, in the Bild interview, he vehemently denied the existence of such a pact, calling it “bullshit” and revealing that one of the three brothers tried unsuccessfully to marry his Jewish girlfriend.

Alexander also said the brothers discussed writing a book about their lives as the last of the Hitler line, but “changed our minds. We won’t do it, not for all the money in the world.”

A lifelong Republican — as are his brothers — he has also lashed out at US President Donald Trump, calling him a “liar.”

“The last person I would say I admire is Donald Trump. He is definitely not one of my favorites. Some things that Trump says are all right. It’s his manner that annoys me. And I just don’t like liars,” he said.