I had entered thomas h vivian another time I put in Tom vivian and played with the names like that, with the exact search.
this was on the fultonhistory.com website. They show up the most in North Towndawanda, NY.
Have you tried to put their address in a search to see if that would pull up an obit.
I could not find an obit or marriage record. I went as far as to look up grandchildren to see if they were mentioned.

They were a very social family, belonging to many groups.
I will keep my eyes open while looking.
Karen