Butler married Bettyne Ione Everard Lady Newtownbutler, daughter of Sir William Lindsay Everard, on 20 December 1939 and had two daughters: Honourable Georgina Ione Butler (15 August 1941 – 28 December 1947) and Lady Denyne Butler (born 23 February 1945).
Butler also held the titles 10th Viscount Lanesborough and 12th Baron of Newton-Butler. Butler inherited Swithland Hall, an estate of 3,000 acres (1,200 ha), from his father, the 8th Earl of Lanesborough, in 1950. However, the death duties entailed in the inheritance resulted in sale of majority of estate.
Butler"s hobby was 600-foot model railway, a replica of the Fort William-to-Carlisle line, with 300 pieces of rolling stocks which had to be dismantled with to reduce death duties.
Butler eventually applied to British Rail for employment driving trains which was declined. However, he was successful with application to sell cars.
After the death of his mother, Countess of Lanesborough, he sold Swithland Hall and moved to Kegworth Lodge before health reasons resulted in moving to Scotland. Denis Anthony Brian Butler (28 October 1918 – 18 August 1929)
Lord Newtown-Butler (18 August 1929 – 22 August 1950)
The Right Honourable The Earl of Lanesborough (22 August 1950 – 27 December 1998).
