It looks like Nellie married her brother in law...
Obituary for Nellie's sister Beatrice in the Globe and Mail 4 March 1963. It says Beatrice Jackson Veness died at the Toronto East General Hospital on March 1 1963. Beatrice Jackson, aged 70, wife of Harold Victor Veness, 9 Haldon Ave, East York. Mother of Tom, Reg, Alf and Ray Holden of Toronto. Sister of Mrs Mildred Taylor, Mrs Nellie Duxbury, Mrs Bessie Gardner and Mr William Jackson of Toronto, and Gertrude Atherton of England. Survived by 14 grandchildren. Interment Highland Memory Gardens.
RK