For many years, Lois Webster has been listed as my husband's 8th great-grandmother, due to an error in "John Stoddard of Wethersfield, Conn., and his descendants, 1642-1872 : a genealogy", by Patterson, D. Williams (David Williams), 1824-1892. (Published 1873).
Surprise! She was William Peck second wife, and GoldiBear's 8th great grandmother is "name unknown". However, the wonderful collaborators at WikiTree left clues for me in William's father's profile, and those sources extend the five generations of William's ancestors already online at WikiTree, an additional generation. By adding my tree to WikiTree, and paying careful attention to the sources in the related profiles there, my tree has grown in many branches, this being only the latest of them.