Frank Miller is Junie B.'s grandfather, or as she calls him, Grampa Miller. When it comes to fashion, Grampa Miller isn't one to follow all of the trends. Grampa Miller has a lot of interests, which sometimes can distract him from what he's doing. Grampa Miller often finds himself staring out the window or daydreaming. Grampa Miller's gentle, relaxed, and easy to get along with. Grampa Miller's secrets are safe-he rarely tells people what's on his mind. Grampa Miller knows how to think for himself, and he makes good decisions easily.