Old Bill (The Wind Through the Keyhole)

“The proddies call me Young Bill.” “Aye, do they? And is your father Old Bill?” He sat up, took Jamie’s bandanna, dipped it in the trough, and squeezed it out so the water ran down his thin chest. “No, Old Bill’s my granther, went into the clearing two years ago.

The Rat caretaker is Bill Colson; Wind Through the Keyhole's Old Bill is Bill Streeter's grandfather. The generic nickname does not establish identity.