According to "The Ryerson Genealogy" by Albert Winslow Ryerson Ada was the daughter of Peter F. Ryerson and Hester Jacobus. Ada and Horace May lived in Fredericksburg, Va.and had children- Effie May-Clara May- Abner May-Raymond May- Frederick May. Peters line back to Martin Ryerson is Francis- William- William- Ryer- Martin. If you need more particulars on this lineage contact me. I am a descendent of Martin through two other of his sons.