Debry was born in Rosières-en-Santerre (Somme). He was a soldier in the First World War. After the war, he met Marguerite Pingaud (10 October 1903 – January 2006), the woman he later married on 12 August 1924 in his home town.
In 2005, André and Marguerite Debry were able to celebrate their 81st wedding anniversary; this set a record for the longest marriage. They lived together in Argenton-sur-Creuse until his death, aged 107. She died four months afterwards, aged 102.