On their first night in the mountains, while the group is still treating their journey like a merry camping trip, Uncle Billy drinks heavily with the others.
Although he’s only suspected of being a thief, his actions in the story prove that he’s deserving of this reputation.
The chief antagonist of the story, Uncle Billy is a drunk and a suspected thief (he is believed to steal gold while other people are panning for it) who is exiled from Poker Flat along with Oakhurst, the Duchess, and Mother Shipton.