Hi Natalie, It seems Rachel Lewis DeGraw was my Dad's paternal grandmother. I don't know her or Seneca's birthdates. How are you related to them?
My Dad told me his grandmother Rachel had had a long interesting life - she went across country in an ox-drawn wagon and lived to see the first cars. She saw enormous change in her lifetime and he found her very interesting to talk to because of it.
The DeGraws in Little Falls were involved in carpet manufacturing. I think Seneca's name was from the Greek. My sister is 84 and she may remember Rachels's or Seneca's parents names - if she ever knew them! no promises!