Hi. I was glad to find your posts!
Grizel Jean Beattie was my 4x great grandmother. Her son William, as you have mentioned, had several wives, and is my 3x great grandfather through his marriage to Elizabeth Graham. Their only child (so far as I know) was Francis Nichol, who emigrated to Ontario, Canada in 1833.
Francis's wife was Janet Nichol (this is her maiden name), daughter of Thomas Nichol and Janet Murray. I have not verified her parents.
Several of Francis and Janet's brothers emigrated with them--I'm in the process of straightening out just who.
I have lots of information about the Nichols from William and Francis on down. What I have for William's ancestry is not as solid, and I'm hoping to find out more. The family lore gives information that I haven't been able to verify, going back to a Sutherland Nichol born 1585.
I love to share information with both of you, and would be happy to send what I have as well!
Carrie Wingate
Maine, USA (via Canada)