 Carstairs' mother, an alcoholic and drug addict, later married Captain Francis Francis, with whom she had two more children, Evelyn (Sally) Francis and Francis Francis Jr. (Frank).She divorced Captain Francis to marry French count Roger de Périgny in 1915, but eventually left him because of his infidelity.Her fourth and last husband, whom she married in 1920, was Serge Voronoff, a Russian–French surgeon who become famous in the 1920s and 1930s for his practice of transplanting monkey testicle tissue into male humans for the claimed purpose of rejuvenation.