Send a message to the person who requested a photo of the grave monument of Sarah Allan with the following comment:
I am preparing a family tree. You may have noticed, I have also sent a request for an image of GPR grave 29146, wherein I eroneously described that grave depicted my great great grandparents. Richard Thomas Allan is the son of Thomas and Sarah, who are in fact my great great grand parents. Therefore, I would also be grateful this image as well. Thanks again.