Graham O’Brien is the oldest of The Thirteenth Doctor’s new friends, played by Bradley Walsh.
Graham is in remission from cancer. Ryan Sinclair’s grandmother had been his nurse while being treated and during that time they had fallen in love and since gotten married. They were married for three years before she died. He cares for Ryan, but doesn’t seem to fully understand his Dysphraxia. At one point he accuses him of regularly blaming mistakes on his disability. Ryan refuses to call Graham his grandfather and asks him not to call him “mate”.