Source: Michael Doyle Their Name Liveth For Evermore: The Great War Roll of Honour for Leicestershire and Rutland.
He was the son of Arthur Cooke a farm labourer, born 1865 in Gilmorton, Leics., and his wife Lucy Annie, born 1865 in Claverdon, Warwks. Leonard Arthur was born in 1899 in Gilmorton, Leics., his siblings were, Percival Alfred, born 1890, Cecil George, born 1893, Elsie Annie, born 1894 and Daisy W., born 1897, all his siblings were born in Gilmorton, Leics., in March 1901 the family home was at Red Lion Street, South Side, Gilmorton, Leics. In April 1911 Leonard was a scholar and was residing in the family home at Gilmorton, Leics., together with his parents and siblings, Percival and Daisy. His elder brother Percival Alfred died.