At the time of his death his brother John was also serving with the Black Watch. His younger brother Michael was at home recovering from wounds and his eldest brother, Lord Glamis, had recently left the Black Watch after being wounded. His mother, Cecilia Bowes-Lyon, Countess of Strathmore and Kinghorne, was severely affected by the loss of her son, and after his death became an invalid, withdrawn from public life until the marriage of her daughter Elizabeth to the future king in 1923. Fergus's widow later married Captain William Frederick Martin (d. 6 October 1947). His widow died on 29 March 1959, aged 68.