Rambert met her husband Ashley Dukes, a soldier on leave, at a dinner party in 1917. In Rambert's autobiography she says "after four days of personal meetings, and seven months of correspondence we were married on 3 March 1918." This was done partly as a joke so that Dukes could get four weeks of extended leave instead of two days. Their marriage lasted 41 years, until he died in 1959; the couple had two daughters, Angela (1920–2006) and Helena. The poet, Aidan Andrew Dun, is her grandson.