I realize that your post re Imlah/Imlay family was an old one, but I am hoping you are still online.
I am looking for a John Imlah/Imlach who would have been born c. 1731 (death records show him being 89 years old when he died in 1821) somewhere in the area of Aberdeen/Inverness. He was in Philadelphia, married to Isabella (also a Scot) but 1757 when their first known child was baptized. Hi fought for the King in the French Indian War. The names of his children were (in order of birth) Isabella, John, James, Margaret, Elizabeth, Ann, William, Sarah, Mary & Charlotte. I have been using the Scottish naming rules - clutching at straws to find a possible birth in Scotland. One such birth has been found in Glassgreen, but it does not ring true to me.
My John was also a farmer and disinherited two sons who did not follow this life.(No idea of the actual reason, however) but it is possible that he came from a farming family.
Do you have any Imlahs (or variants) in your files who could possibly fit my John?