His Uncle Died Fighting Nazis

The uncle in question is Joseph Patrick Kennedy, Jr.  And he died when the aircraft that he was flying as part of Operation Aphrodite blew up as the fuses for the explosives it was carrying were being armed.

The Nephew, of is Robert Fitzgerald Kennedy, Jr., who is, as Mike the Mad Biologist observes, who now plays at Nazi peekaboo:

I’m stealing Amanda Marcotte’s phrase ‘Nazi Peekaboo‘ because it describes what Democratic primary candidate and anti-vaccinationist crank RFK Jr. did last Friday. His account tweeted a complaint about not receiving Secret Service protection, and phrased it like so (boldface mine):

Typical turnaround time for pro forma protection requests from presidential candidates is 14-days. After 88-days of no response and after several follow-ups by our campaign, the Biden Administration just denied our request. Secretary Mayorkas: “I have determined that Secret Service protection for Robert F Kennedy Jr is not warranted at this time.”

Our campaign’s request included a 67-page report from the world’s leading protection firm, detailing unique and well established security and safety risks aside from commonplace death threats.

(emphasis the aforementioned angry biologist)

14/88 has its own Wiki page.

14 refers the following phrase, "We must secure the existence of our people and a future for white children," and 88 stands for the 8th letter of the alphabet repeated twice, HH, which stands Heil Hitler.

"Nazi Peekaboo," is one way to refer to this, but the more general term is, "Dog Whistling." 

When George W. Bush referred to compassionate conservatism, he was dog whistling to the religious right, saying that he wanted to everyone out of the social safety net, and when he listed Dredd Scott as the worst Supreme Court decision he was actually talking about how he wanted to overturn Roe v. Wade.

When Ronald Reagan started his 1980 Presidential campaign in Philadelphia, Mississippi, where civil rights activists were murdered by the Klan and the police, and called for greater states rights, he was endorsing segregation.

To some degree this occurs in most politics, but the use of these code words is particularly prevalent among the right wing, racist Talibaptists, and opportunist hypocrite fellow travelers.