Hello, I can't answer your specific questions but you may be able to help me with some of my family. It seems too great a coincidence that the names you mention are the same/similar to my family.
From my great grandmother's death certificate I have the following information. She was Jane Smith nee Aitken and died in New Zealand 19th May 1910 age 78. Her mother is listed as Anabella Aitken nee Baird and her father as William Aitken.I have looked through various sites and am not sure if William is the correct name but who knows. Jane was married to Thomas Smith 4th Dec 1853 in Old Monkland. We have been led to believe that there was some family connection to a laird of Gartsherrie but who knows how distant that connection might have been.