She was the daughter of George Johnston, a landscape gardener, and his wife, Alice (née Percival).
Her first marriage was to Swiss-American Captain André de Coppet (1892 - 1953), DSC, late of the US army on 6 November 1943 in New York City.
In 1953, Eileen was widowed for the first time when André died in Lausanne, Switzerland on 1 August 1953.
In 1973, Eileen was widowed for a second time when Carol Victor died at Munich, Bavaria, on 8 December 1973 (buried Neuwied am Rhein).
The house became extinct on his death as he had no children, and no arrangements had been put in place for a successor.