Not the daughter of Adam Schiff:
“Melissa Robin Schiff, the daughter of Marlene S. Schiff of New York and the late Dr. Haskel Schiff, was married May 5 [1992] to Robert Daniel Soros, a son of Annaliese Soros and George Soros, both of New York. Rabbi Dr. David Posner performed the ceremony at Temple Emanu-El in New York.”
This is from a 1992 NYT article. http:// www.ny times.com/1992/05/24/style/weddings-melissa-schiff-robert-d-soros.html