Chelsea Clinton's husband Marc Mezvinsky is not George Soros's nephew.
Chelsea Clinton is married to Mezvinsky, an investment banker and the son of Marjorie Margolies-Mezvinsky and Edward Mezvinsky, both former Democratic members of the U.S. House of Representatives, according to PolitiFact.
The claim isn’t a new one, and it gained traction last year when the actress Roseanne Barr accused Clinton of being married to Soros’ nephew and tweeted: "Chelsea Soros Clinton."
Clinton retweeted Barr's tweet, which was deleted and refuted the claims: "Good morning Roseanne - my given middle name is Victoria. I imagine George Soros’s nephews are lovely people. I’m just not married to one. I am grateful for the important work @OpenSociety does in the world. Have a great day!" Open Society Foundations is a philanthropic organization founded by Soros.
According to Vox, Barr, who is a local supporter of President Trump, has had a history of pushing far-right conspiracy theories ranging from MK Ultra (a real CIA experiment on human test subjects that conspiracy theorists believe is still being used by the government) to the claim that the 9/11 attacks were an inside job.
On the other hand, George Soros has been at the epicenter of many other far-right conspiracy theories, the most recent ones being Soros owning ANTIFA and Black Lives Matter.
Snopes reported that Soros had one brother, the late Paul Soros, who fathered two children, Peter and Jeffrey Soros. Neither of his nephews is married to Clinton.