Thread:GreysMedSurgFan/@comment-4287993-20170910094511/@comment-25784202-20170910095341

I don't believe he would refer to a patient simply as "Grandpa". Normally, unnamed patients are usually described with their condition, "that chole patient" "that peds patient" "that burn kid", and just before he brought up Grandpa's case, he said, "the young mastectomy patient."

He referred to Harper as "Grandpa" back in season 6, and Jackson referring to the patient now as "Grandpa" leads me to believe that it is his grandfather, Harper Avery.

Otherwise, he could have said, "the grandfather patient" or something less familial.