Arthur's Great-Grand Uncle Theo is celebrating his 85th birthday, so the Reads are off to Ohio to join in the festivities. While D.W. and Arthur learn that farm life is a little different than life in Elwood City, Buster worries he may be getting in the way at this family reunion. With the help of Cousin Miles, some llamas, and a little bit of music, they all discover what it truly means to be family.