He was a descendant of the Wyndham family, who owned the Felbrigg estate in Norfolk, and was known as "the Last Squire". He inherited the estate on the death of his father in 1933. Wyndham Ketton-Cremer's heir, his younger brother Richard, died in Crete during the Second World War. Ketton-Cremer also owned the Beeston Regis estate, including what is now Beeston Hall School.