Jane's great-grandmother

Jane's great-grandmother is the great-grandmother to Jane Read, Fred, and Lucy. She is mentioned in the episode The Tattletale Frog where Jane says her great-grandmother was given a gift from her great grandfather. It is unknown whether or not her great-grandmother is from grandpa Daves side of the family or Janes Mothers side of the family, however she is most likely from Janes father, grandpa Daves side of the family since her mother is not talked about in the series.