Mosco Burrows
From Tolkien Gateway
The eldest of the four children of Milo Burrows and Peony Baggins, Mosco was related to both Bilbo Baggins and Frodo Baggins, but only in the most distant manner. He was present at Bilbo's famous Farewell Party at the age of just fourteen. At the time of the War of the Ring, he would have nearly come of age, but there is no record to show whether he played a part in the Shire's troubles at that time.