I hope this post helps someone.

Rhoda Robb was born around 1846, New Baltimore or Coxsackie Townships, Greene County, NY (her death certificate states Coxsackie, but I have found her family living in New Baltimore when she was about 4 yrs old). She was the daughter of William James and Dinah (or Diana) Bigraff. She had a sister named Mary.

Rhoda Robb married James Alfred Robb (of VA) and lived with him in MA. until her death in 1945. I am not certain of when she came to MA. James and Rhoda had several daughters, Virginia, Edith, and Lillian are the ones that I know of. There were at least five daughters.

Rhoda lived in Cambridge, MA with her family and died there in 1945. Rhoda had a cousin named Daisy Johnson who was also from NY.

I have not made a connection between the Johnsons and the Bigraff families yet, but when I have more information I will post.

I have not found much on James Alfred Robb, other than the fact that he was born in VA.

Hope this helps.
Andrea