While she was legally the daughter of Sir Henry Hozier, her mother Lady Blanche's known infidelity and his suspected infertility makes her paternity uncertain.

After Sir Henry found Lady Blanche with a lover in 1891, she managed to avert her husband's suit for divorce because of his own infidelities, and thereafter the couple separated.

Clementine's biographer, Joan Hardwick, has surmised (due in part to Sir Henry Hozier's reputed sterility) that all Lady Blanche's "Hozier" children were actually fathered by her sister's husband, Bertram Freeman-Mitford, 1st Baron Redesdale (1837–1916), who is also known as the grandfather of the famous Mitford sisters.

[2] The Hoziers' happy life in France ended when Kitty, the eldest daughter, was struck with typhoid fever.

[5] On their first brief encounter, Winston had recognised Clementine's beauty and distinction; now, after an evening spent in her company, he realised she was a girl of lively intelligence and great character.

[12] During the First World War, Clementine Churchill organised canteens for munitions workers on behalf of YMCA in the North East Metropolitan Area of London, for which she was appointed a Commander of the Order of the British Empire (CBE) in 1918.

[13] Clementine travelled to Dundee in 1922, campaigning on behalf of her husband in the 1922 general election while he was incapacitated after having his appendix removed.

[14] In the 1930s, Clementine travelled without Winston aboard Lord Moyne's yacht, the Rosaura, to exotic islands: Borneo, Celebes, the Moluccas, New Caledonia, and the New Hebrides.

Once, traveling with Lord Moyne and his guests, the party was listening to a BBC broadcast in which the speaker, a vehemently pro-appeasement politician, criticised Winston by name.

Clementine waited for her host to offer a conciliatory word but, when none came, she stormed back to her cabin, wrote a note to Moyne, and packed her bags.

After Sir Winston's death, on 17 May 1965, she was created a life peer as Baroness Spencer-Churchill, of Chartwell in the County of Kent.

In her final few years, inflation and rising expenses left Lady Spencer-Churchill in financial difficulties and in early 1977 she sold at auction five paintings by her late husband.

Lady Spencer-Churchill died at her London home, at 7 Princes Gate, Knightsbridge, of a heart attack on 12 December 1977.

[23] Churchill was played by Virginia McKenna in the 1974 television biopic The Gathering Storm opposite Richard Burton.