While at Repton, Fisher met Rosamond Chevallier Forman, and they were married on 12 April 1917 and based on Webster, a person who wrote Fisher's biography,  that marriage was lifelong and mutually supportive.
While at Repton, Fisher met Rosamond Chevallier Forman, who was the daughter of a former master at Repton and a granddaughter of S. A. Pears, a famous headmaster of the school. They were married on 12 April 1917; they had six children, all sons. Webster writes that the marriage was lifelong and mutually supportive. His biographer Alan Webster writes: 
