The 1875 marriage.... (Used a spare credit)
Robt Hawkins, age 32, Private 1st Royal Scots, Edinburgh Castle, son of Wm Hawkins Agr Lab & Elizabeth Spear.
Maggie Thom, age 20, Spinster, daughter of John Thom, Joiner journeyman & Helen McRobb
Very kind of you to use your own credits,
Kloumann.
As the certificate says simply 'Helen McRobb' rather than 'Helen Thom MS McRobb' it looks as if Margaret was illegitimate.
There is a birth of Helen Thom McRobb, mother Helen McRobb, no father named, on 23 December 1857 in Grange. (So she lied about her age on her marriage certificate - she was only 18, not 20, when she married.)
The 1871 census found by
Milliepede looks right, and it confirms that George Thom was Margaret/Maggie's uncle, and by inference that her father John Thom was the son of John Thom and Margaret Goodbrand.
In 1861 the family were at Brickfield*, district of Seafield
John Thom, 45, manager tile works, born Banff
Margaret, wife, 45, Cullen
Isabella, 22, Cullen
Margaret, 13, Rathven
Alexander, 10, Rathven
George, 7, Rathven
William, 5, Rathven
Margaret, granddaughter, 3, Grange
*This is next door to Lintmill and Tochieneal, south of the town of Cullen. On this map
https://maps.nls.uk/geo/explore/#zoom=16&lat=57.67338&lon=-2.80779&layers=5&b=1 named as Tochieneal Tile Works.
In 1851 they are listed at Lintmill, so in the same place, even though in that year it is listed under Rathven rather than Seafield
John, 33, manager tileworks, born Banff
Margaret, 36, Cullen
Isabella, 12, Cullen
John 10, Cullen
Jane, 7, Cullen
William, 5, Rathven
Margaret, 3, Rathven
Alexander, 2 months, Rathven
There is a family at Sillyearn, Grange in 1861 consisting of
George McRobb, 58, born Glass
Helen McRobb, 59, ?Glenrinnes
Helen McRobb, 21, Keith
William McRobb, 12, Grange
George Connon, grandson, 5
Margaret Stewart, granddaughter, 2
William Proctor, grandson, 8 months
All census information from
https://freecen1.freecen.org.uk/cgi/search.pl - you can and should view the originals at Scotland's People.
If I were you I would look at the birth certificate of Margaret Thom McRobb and see exactly where she was born. If it was at Sillyearn, I think that would fully nail her parentage.
There may be other information about the Thom and McRobb families at
http://libindx.moray.gov.uk/mainmenu.asp