This family stuff is very interesting.
I actually have a copy of a family tree that has Thomas and Mary Hill on it. Decendants include Robert of Sheerness (Married to Ann Munday) and several offspring. I would be happy to share this.
This family tree was prepared by Fred Edmeades board at Sheerness March 20, 1869. Please let me know if you are interested, I would be happy to share any information I have as well.