it happened when the researchers for the film tracked down lionel logue's grandson, mark logue, becauseded family photos to get the clothing right. and you told them what? >> mark logue: i told them, "yeah, i've got pictures. i've got some diaries, too." >> pelley: his grandfather's diaries were up in the attic in boxes that the family had nearly forgotten. when mark logue hauled them down for the movie, he discovered more than 100 letters between the therapist and his king. >> logue: "my dear logue, thank you so much for sending me the books for my birthday, which are most acceptable." that's so british, isn't it? "yours very sincerely, albert." >> pelley: as you read through all of these letters between your grandfather and the king, what did it tell you about the relationship between these two men? >> logue: it's not the relationship between a doctor and his patient; it's a relationship between friends. >> pelley: we met mark logue at the same address where his grandfather treated the king. and among the hundreds of pages of documents were logue's first observations of george vi. >>