Hiya, thanks for getting back. I'm sure there is a Dewar connection between us and perhaps McQuaig one as well. As my 3x gg-grandmother was also a Catherine McCuaig, born in 1809 in Glenelg and married to Roderick Oag McLeod.
I will have a closer look at your McNamara Family Tree and see what I can see and will get back to you.
In the meantime I think your Sarah Dewar may be more directly connected to the family at this link than to mine.http://www.mocavo.com/family-tree/David-McLellan/Genealogy-o...
Thanks for the information you've provided already,