Both b. abt. 1850-60 and m. abt. 1870-80.She had siblings: Lucy b. 1853 m. J. Douglas, Clara m. J. Casselman and another ? sister & ? brother. Father was John Browne.She came to Iowa to teach where she met Calvin.They came down from Picton, on Prince Edward Island, Canada. All lived in Chicago at he Chicago World's Fair.Does any of this fit your tree?Willing to share if you have other info or dates?