Send a message to the person who requested a photo of the grave monument of John Avis with the following comment:
I believe this could be the grave of my Great-Grandmother's brother John and their father James, my Great-Great-Grandfather. Thank you for all your efforts - by volunteering your time and money, you save us time and money travelling to do it ourselves. This opportunity to gain more knowledge in our quest for family history is much appreciated, thank you.