John Oscar Douglas (Chappie) Knowles
- Born: 20 Oct 1889, Johannesburg, Transvaal
- Christened: 8 Apr 1893, St Cyprian Church, Durban, Colony of Natal
- Marriage (1): Margaret (Sissy) Hagens on 22 Jul 1925 in Durban, Natal, South Africa
- Died: 4 Jul 1967, 17 Forest Hill, St Thomas Road, Durban, Natal, South Africa aged 77
John married Margaret (Sissy) Hagens, daughter of William Hagens and Mary Miller Robertson, on 22 Jul 1925 in Durban, Natal, South Africa. (Margaret (Sissy) Hagens was born on 16 Feb 1901 in Greenock, Renfrewshire, Scotland and died on 20 Oct 1985 in Pietermaritzburg, Natal, South Africa.)
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