They had two children: Their elder son, the 7th Earl of Harewood, wrote about his parents' marriage in his memoirs The Tongs and the Bones and describes their relationship, saying that "they got on well together and had a lot of friends and interests in common".

[6] He was an honorary attache at the British embassy in Paris from 1905 until 1907, then served as aide-de-camp to the governor general of Canada, Earl Grey, until 1911.

[6] He continued with the yeomanry after the outbreak of the First World War until he rejoined the Grenadier Guards for service on the Western Front in April 1915.

[8] He continued his interest in the Territorial movement after the war, as Honorary Colonel of the 1st (City of London) Battalion, London Regiment (Royal Fusiliers) from 1923, the 5th Battalion West Yorkshire Regiment from 1937, and as president of the West Yorkshire Territorial Forces Association from 1928.

[9] After the war, Lascelles remained interested in local Yorkshire issues and events, often contributing to the Leeds Board of Management.

[1] Interested in equestrian sports, he served as Master of the Bramham Moor Hounds from 1921,[8] was a steward of the Jockey Club, and co-editor of Flat Racing (1940) for the London Library.

He declared in later life "every war in which Britain had been involved had been due to the inefficiency of politicians, and they began what soldiers had to end".

It is widely understood that Virginia Woolf based the character of Archduke Henry on him in her novel Orlando, a tribute to her lover Vita Sackville-West.