Send a message to the person who requested a photo of the grave monument of Ann Braithwaite with the following comment:
I'm fairly confident that William Snr.is my gt-gt-gt-grandfather (and thus his wife Ann would be my my gt-gt-gt-grandmother. Their birthdates are both exactly 5 years out of sync with my info (as is their son Robert's birthdate): curious and yet consistent enough to make me confident.