Gladys Vanderbilt married Hungarian Count László Széchenyi on January 27, 1908 in New York City. The couple visited Hungary almost every summer with their five daughters:
Cornelia Széchényi who married Eugene B. Roberts of Bowie, Maryland, and had three children, Gladys, Cornelia and Eugene.
Alice Széchényi married Hungarian Count Béla Hadik and had two sons, László and János.
Gladys Széchényi married the English Earl of Winchelsea and Nottingham, and had two sons, Stormont and Robin. The family surname is Finch-Hatton.
Sylvia Széchényi married Hungarian Count Antal Szapáry, and had two children, Pál and Gladys.
Ferdinandine Széchényi married the Austrian Count Alexander zu Eltz and had two sons, Peter and Nicholas.