I have had a brick wall regarfding Rosanna for so long - thank you for knocking a big hole in it :o)
Do you have any other children for William and Rosanna? I could send you a gedcom of my Graham/Bristow families. Do you have a software program that will accept a gedcom?
I don't always have access to Ancestry.com, so please e-mail me at firstname.lastname@example.org
I have more questions, but think the easiest way for you to see what I have and don't have would be if I sent you a gedcom.