This is the first time I have seen a post which mentions Margaret Mackay and Margaret Fraser as both being wives of William Robertson. I believe this is correct. Margaret Mackay was his first wife and Margaret Fraser his second. William Robertson married his house servant Margaret Fraser in 1842. She was listed in the Census of 1841. I have proof in the form of certificates and baptism records that Margaret Mackay was the mother of William, John, Margaret, Angus and Mary Robertson. Their mother is not listed on the 1841 census so I assume she is dead.
Name William Robertson
Gender Male
Marriage Date 15 Dec. 1842
Marriage Place Moy and Dalarossie, Inverness, Scotland
Spouse Margaret Fraser
FHL Film Number 1068236
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Then William Robertson and Margaret Fraser went on to have five children- Duncan, George, Catherine, James and Donald. Mary is listed as their daughter on many family trees but this is not correct. Her mother was Margaret Mackay.
Name Mary Robertson
Gender Female
Age 0
Birth Date 13 Apr. 1835
Baptism Date 17 Apr. 1835
Baptism Place Alvie,Inverness,Scotland
Father Wm. Robertson
Mother Margaret Mackay
I am convinced that Margaret Fraser his second wife was his housekeeper in 1841. I hope this helps you. I am so pleased to see that someone else has the same idea as me. It is very difficult to find proof as there are so many William Robertsons and Margaret Frasers. I'm hoping that if I can get some DNA proof eventually. This is my husband's family.