 Richard (Dick) Loudon McCreery was born on 1 February 1898, the eldest son of Walter Adolph McCreery of Bilton Park, Rugby, a Swiss-born American who spent most of his life in England but who represented the United States at polo at the 1900 Summer Olympics.His mother was Emilia McAdam, a great, great granddaughter of the Scottish engineer John Loudon McAdam, famous for his invention of the process of "Macadamization", a method of road surfacing, and great granddaughter of James Nicoll McAdam, known to his contemporaries as "The Colossus of Roads".Emilia's father had been a major in the 7th Dragoon Guards.