Question: how are bilbo and frodo baggins related?
Answer: Frodo is the son of Drogo, who is the son of Fosco (son of Largo, Mungo's younger brother). ... Since that makes Bilbo and Drogo second cousins, Frodo is Bilbo's second cousin once removed. And (I almost forgot)--Frodo's mother Primula Baggins (nee Brandybuck) is a first cousin of Bilbo on his mother's side.