[1] He was baptised, a son of Francis Henry Schmitz (1856–1914), a clerk from Paris, and his wife, Annie Maria (née Mower; 1858–1942), at St Clement, Notting Hill in the Royal Borough of Kensington and Chelsea on 26 May 1878.

[4][5] Lyndhurst stored his films in a barn, which was destroyed by bombing during World War II.

[6] Lyndhurst bought a farm, in order that his sons should avoid fighting in the Second World War.

[7][3] Schmitz married Dorothy Constance "Dora" Rogers (born 28 March 1887) in Brentford, Middlesex in January 1907.

[23] In October 1916, he unsuccessfully sued a man, John Bull, for libel, for calling him "German", claiming it was the worst possible insult.