Rob You have 19 children born to Daniel Lothrop and his 2 wives. Do you have dates of birth for any of those children?
I have found several records for the children of my Daniel and Lucy Lothrop, but William G. is not among them. The William G. that I was searching for born 1816-17 may be the son of your Daniel. Did Daniel leave a will?
If the William I was searching for married 1st in Maine, perhaps there is a record? in Leeds?