In the 1911 census 18 Stanley Road, Wimbledon, Surrey
Head William French, age 56, thermometer maker, scientific instrument maker, worker, born Dublin.
Wife Gertrude French, age 48, married 29 years, 5 children born alive, 4 still living, born Surrey.
Daughter Mary French, age 16, student, born Surrey.
Son Harold French, age 10, student, born Surrey.
Visitor Maxim Lecouffe, age 20, single, student, born Chocques, France.
Visitor Andre Minart, age 20, single, student, born Lille, France

In the 1921 census 8 Sutton Court Mansions, Grove park Terrace, Chiswick, Middlesex
Head William French, age 66 years 4 months, born Dublin, Ireland, thermometer graduated, own account -105 Hattorn Gardens EC
Wife Gertrude French, age 59 years 6 months, born Bermondsey, London, home duties
Daughter Mary French, age 26 years 6 months, single, born Camberwell London, lady clerk - Labour Party, 33 Ecclestone Square
Son Harold French, age 21 years 2 months, single, born Camberwell, London, actor - Reandeau Theatre Co. Ltd., Aldwych