 On October 15, 1885, at St Mary Abbots, Kensington, Claflin married Francis Cook, chairman of Cook, Son & Co., drapers, and also Viscount of Monserrate in Sintra on the Portuguese Riviera.Within months of their marriage, Queen Victoria created a Cook Baronetcy.As the wife of an English Baronet, Claflin was thereafter correctly styled "Lady Cook", and in Portugal was also Viscountess of Monserrate.