Oscar de la Renta married Annette Engelhard (born 1939), daughter of Fritz Mannheimer and his wife Jane née Reiss, and adoptive daughter of her mother's second husband, Charles W. Engelhard, Jr. De la Renta had stepchildren from both marriages. His son-in-law Alex Bolen currently operates as Chief Executive Officer, and stepdaughter Eliza Bolen serves as Vice President of Licensing at Oscar de la Renta, LLC. De la Renta was regarded as an unofficial ambassador of the Dominican Republic, his home country, and held a diplomatic passport. He had homes there in Casa de Campo and Punta Cana, in addition to his residence in Kent,
Loulou de la Falaise and accessories for Saint Laurent, La Falaise launched her own fashion business, designing ready-to-wear, costume jewellery, and accessories, which were retailed in the U.S. as well as two Loulou de La Falaise shops in Paris. She sold simplified versions of her jewellery designs in a line created for the Home Shopping Network and created costume jewellery for Oscar de la Renta. She operated two of her own shops in Paris, one of which was designed by her brother, Alexis. On 6 October 1966, she married Desmond FitzGerald, 29th Knight of Glin (1937-2011), an Irish nobleman. They separated the following year