Dad's history is difficult to track. His parents were both adopted. Their parents are difficult to track because official records available online have not been found.
My guess is that many of the Wallace family members were born at home because the families were not well off.
Dad's father was born out of wedlock. According to Dad, family oral history records the father as the brother of Grace A. Sprague, who married Rolland Wight. Grace and Rolland are listed in a few online databases. Using this information, I found Grace's parents family in the census records. They lived in Easton. Her only brother was Leon C. Sprague. So far online databases have no other record of Leon.
Dad's family also believes his father's mother to have been a Brown from Easton who eventually moved to Corinna, ME. Interestingly, just above Leon Sprague's family in the 1900 census is a Brown family. This would put the families in the same neighborhod. The Brown's had a son named Harvey and two girls, Cora and Linnie. Cora was about a year older than Leon and Linnie was a year younger. At this point, it's my best lead to track down my grandfather's mother.
Mom's family is much easier to trace, at least for the last few generations.