Milo Burrows
From Tolkien Gateway
A grandson of Master Gorbadoc Brandybuck of Buckland, who married into the Baggins family when he wedded Peony, a distant cousin of both Bilbo and Frodo Baggins. They had four children (Mosco, Moto, Myrtle and Minto), and most of the family was present at Bilbo's famous Birthday Party (apart from Minto, who was only five years old at that time).
Milo was known for his habit of failing to reply to letters, and because of this he was one of those that found a specially selected gift waiting for him in Bag End, after Bilbo's departure: a golden inkpot and pen.