Dame Dehra was first elected as a Member of Parliament for Londonderry, as Dehra Chichester (which she was known as prior to her second marriage in 1928), in the Northern Ireland general election, 1921.
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She stood down at the 1929 election just before her second marriage but was elected unopposed as Dehra Parker in the 15 March 1933 by-election for the South Londonderry constituency following the death of her son-in-law James Lenox-Conyngham Chichester-Clark, and served until her resignation on 15 June 1960.
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He was married to Marion Caroline Dehra Chichester, daughter of Dame Dehra Parker and had three children; James Chichester-Clark, Baron Moyola, Robin Chichester-Clark and Penelope Hobhouse.
His wife Dehra was also a politician while their daughter Marion Caroline Dehra was the mother of politicians James Chichester-Clark, Baron Moyola, and Sir Robin Chichester-Clark and of gardening writer and television presenter Penelope Hobhouse.