[9] On 25 July 1899, at Holy Trinity Church, Sloane Street, Cadogan Square in London, England, de Meyer married Donna Olga Caracciolo, an Italian noblewoman who had been divorced earlier that year from Marino Brancaccio; some said she was a goddaughter of Edward VII.

He continued by observing, "Marriage based too much on love and unrestrained passion has rarely a chance to be lasting, whilst perfect understanding and companionship, on the contrary, generally make the most durable union".

[14] After the death of his wife in 1931, Baron de Meyer became romantically involved with a young German, Ernest Frohlich (born circa 1914), whom he hired as his chauffeur and later adopted as his son.

During the World War I years, de Meyer brought to Vogue an Edwardian style featuring a rebellion against the rationality of the second industrial revolution and a fashion movement that was characterized as a queer counterculture.

[21] Today, few of his prints survive, most having been destroyed during World War II but some 52 photographs of Olga, packed by his adopted son Ernest, came to light in 1988 and were published in 1992.

[22] He died in Los Angeles on the anniversary of his wife's death, 6 January 1946, being registered as 'Gayne Adolphus Demeyer, writer (retired),[23] and was buried at Forest Lawn Memorial Park in Glendale.