Richardson's nephew Ralph Richardson became a noted actor. His great-nephew (through his wife Dorothy's eldest brother, (James Clerk) Maxwell Garnett, C.B.E.), Julian Hunt, went on to become a meteorologist and director general and chief executive of the British Meteorological Office from 1992 to 1997. A great-niece – of the same line of descent – is the former politician Virginia Bottomley, now Baroness Bottomley.
