Hi there
The IGI gives this info for their marriage:
JOHN BOWER
Spouse: JANE SINCLAIR
Marriage: 07 MAY 1875
Dunfermline, Fife, Scotland
and this appears to be the info on the family in 1881:
Living at 6 Store Row in Dunfermline, Fife, Scotland
Source of Data: FHL Film 0203521 GROS Data: Vol 424 ,ED 27, Page 15
John BOWER age 27 b. Aberdour, Fife, Scotland, Head, Coal Miner
Jane BOWER age 25 b. Dunfermline, Fife, Scotland, Wife
William BOWER age 5 b, Beath, Fife, Scotland, Son
Anne BOWER age 3 b. Beath, Fife, Scotland, Dau
Helen BOWER age 4m b. Dunfermline, Fife, Scotland, Dau
Because you have an exact date of marriage you should be able to view the MC on
www.scotlandspeople.gov.uk website and learn for certain who her parents were. Her mother's maiden name will be stated there.
A look on the 1861 Ancestry Scottish census index only shows a Joan Sinclair, age 3, with parents named John and Mary or a Jean Sinclair age 5 with mother apparently named Margaret. Didn't see a John and Ann though.
Best wishes
Jean