Hi Mary:
I have drawn the conclusion that Mary's parents were James M. and Charlotte (Bolding) Pybus. Her siblings were Henry C., James C., Charlotte, Martha F., and Mary E., and Sarah D.
I've been digging rather diligently for this line. Sarah Dulcene is my husbands grgrgma and it's a real tough line to trace. Let me know if you need anymore info.
Cindy