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Daughter of Frederic Thesiger, 1st Viscount Chelmsford and Frances Charlotte Thesiger, Viscountess Chelmsford Wife of Baron Donough Edward Foster O'Brien, 16th Lord Inchiquin Mother of Lady Deirdre Jane Frances Chapin and Private Weir Sister of Hon. Joan Frances Vere Thesiger and Andrew Thesiger, 2nd Viscount Chelmsford
https://genealogics.org/getperson.php?personID=I00128982&tree=LEO