Background
Mills was the second son of Charles Mills, 2nd Baron Hillingdon, and the Honourable Alice Marion Harbord, daughter of Charles Harbord, 5th Baron Suffield.
Mills was the second son of Charles Mills, 2nd Baron Hillingdon, and the Honourable Alice Marion Harbord, daughter of Charles Harbord, 5th Baron Suffield.
In 1919 he entered the House of Lords on the death of his father. Lord Hillingdon married the Honourable Edith Mary Winifred Cadogan, daughter of Henry Cadogan, Viscount Chelsea, in 1916. Lady Hillingdon was chairman of the Central Women"s Advisory Committee of the Conservative Party and was made a Dame Commander of the Order of the British Empire in 1939.
Lady Hillingdon died in December June 1969, aged 73.