Guinness's first marriage was to The Hon.
Joan Barbara Yarde-Buller (1908–1997), eldest daughter of the
3rd Baron Churston. Before their divorce, they had a son, Patrick Benjamin Guinness, who was killed in an automobile accident near
Rarogne, Switzerland. Joan left him for
Prince Aly Khan, the eldest son of the
Aga Khan III, the 43rd
Shia Imam, and Guinness successfully sued Joan and Khan on grounds of adultery. Joan and Khan did not defend the charges and the judge,
Mr Justice Bucknill, granted Guinness a
decree nisi and full custody of their son and ordered Khan to pay court costs. Joan married Khan on 18 May 1936, a few days after the divorce became absolute. In 1936, he married his second wife,
Lady Isabel Violet Kathleen Manners (1918–2008), daughter of the
9th Duke of Rutland. The Guinnesses were prominent in society at
Palm Beach. Together, they were the parents of a son and a daughter,
Serena Belinda Rosemary ("Lindy") Guinness, who became the Marchioness of Dufferin upon her marriage to the
5th Marquess of Dufferin. On 7 April 1951, he married his third wife, the Mexican socialite
Gloria Rubio y Alatorre (1913–1980). Her daughter,
Dolores married his eldest son. On 31 December 1988, Guinness died of
heart disease at
The Methodist Hospital in
Houston, Texas, United States. He was buried with the remains of his third wife at the
Bois-de-Vaux Cemetery,
Lausanne. ==References==