The picture is of Urania the mother's tombstone in Tillotson cemetery in NY. If you let me know your email address, I can invite you to my website, where I have the copy of the tombstone along with a lot of other information.
Have you been able to determine the parents of Solomon or Polly? I am guessing that the father is Henry Vose, Vorse but I have not been able to confirm this. I also would love to know the parents of Polly.