I'm quite interested in this couple as well.
My James Innes m 1797 Huntly ABD, Isabel Mair.
Issue:
William 1798 Cobairdy Forgue ABD, m 4 Jan 1819 Cullen BAN, Ann Watt
Alexander 1801 Ordiquhill BAN, m 18 Nov 1826 Cullen BAN, Isabel Ross b abt 1795 Bishopmill MOR
Isabel 1807 Ordiquhill BAN, m 1 Feb 1829 King Edward ABD/15 Feb 1829 Gamrie BAN, Wm McDonald.
I have often thought that William Mair and Elizabeth Shepherd were parents of my Isabel but have never managed to get anywhere with it. Witnesses to the births of the seven daughters: Alex Spence, James Manson, Alex Farquhar, John Rainy [Rennie?], James Mair, James Walker, John Henderson, James Andrew, John Walker, and William Walker. None of them mean anything, yet.
James Innes and Isabel Mair's first son was named William, perhaps taking precedence over James' father because William Mair had no sons or, James Innes' father was also a William... just a thought.
I also note that Isabel Innes had her marriage to William McDonald registered in Gamrie as well as King Edward...another thought.
Someone has a tree up at Ancestry where they have made the jump and have posted my Isabel Mair m James Innes as daughter of William Mair and Elizabeth Shepherd. Offhand, I don't recall seeing any proof of the connection.
1841 Huntly ABD census has Isabella Innes, pauper, 70 yrs [b abt 1767-1771], b outside of ABD. This may be Isabel Mair Innes but again, I haven't located her death or any way of verifying her.
Have you had a DNA test done? A descendant of Isabel Innes b 1807 and Wm McDonald has recently compared their DNA to mine and we have managed to confirm our connection and finally put to bed Isabel Innes McDonald's erroneous death certificate where her parents are listed as "Wm" Innes and Isabel "Horn". Perhaps we can do something similar...although I'm a complete DNA idiot (the cousin compared our results - perhaps he'll have a look at ours as it would solve the same question for him).
Pat Innes