I tracked two lines of Fay in my post and you say you descend from George and Lucinda, right?
If you like to continue the discussion and for me to send you digitals we can reach me at firstname.lastname@example.org. I'd be happy to send you what I have. Please confirm the line as George and Lucinda, okay.
Have you looked at the unofficial Fay website? I think the URL is www.fayfamily.org. It is a bit tough to navigate but you may find info on your line. Whatever you find, verify it with a primary source.
I haven't tied George and Lucinda to an immigrant father - Fay in Marlborough to be specific. But would like to find when his line immigrated. There are Canadian (Irish) Fays and there are English Fays. What is your family story?