Neither the Fox nor the Davies families were armigerous, so in 1905, when Fox-Davies was 34 and already well-advanced in his career as a writer on heraldic and genealogical subjects, he organised posthumous grants of arms to both his grandfathers. The arms granted to Charles Davies were "sable, a demi sun in splendour issuant in base or, a chief dancetée of the last", with, for crest, "a demi dragon rampant gules collared or, holding in the dexter claw a hammer proper"; those granted to John Fox were "per pale argent and gules, three foxes sejant counterchanged", with, for crest, "a demi stag winged gules collared argent".