I think most of this is already in Ancestry.com, however, will plug in in case it has disappeared as I have not been a member in years.
Isaaac Gross came from England in 1635 Had a son, Clement who had a son Simon, my records show he was born in 1676 in Hingham, MA, Simon married Betsy Treat and they had a son, Jonah who married Sarah Ladd in 1780. Simon later married Sarah Ladd in 1780.
I also have a letter which states that it came from the family bible in the possession of Sylvia Gross of South Edmonton, NY. It states that Simon Gross came from France and resided in Hingham, MA and he was born in 1709. (that conflicts with info. above which came from my great Uncle Robert Gross and is stated above. The Gross family back then, in Hingham were Brewers. Most of this should be on ancestry but if you would like more detailed information, let me know.