As a matter of self-preservation, the settlers formed brotherly associations which swapped cards on which were written the names of the Three Brothers of the Peach Orchard in The Romance of the Three Kingdoms--Liu, Kuan and Chang.
為求自保，先民們彼此邀約結夥、做「換帖」兄弟，而劉、關、張「桃園三結義」正是他們的榜樣，其中關公更以「忠義」為人敬重。