I am trying to find out Sarah's birth parents. William Dobbs was my ggrandfather. I need to know Nancy's maiden name. Was Nancy Sarah's mother?

And where did they live (william and wife?)
thank you so much, wm dobbs is my stumbling block... I have been trying to find him and nancy for twelve years. Just when I am getting close... I get another door shut
barb dobbs-hagy
sunshinekids64@gmail.com