Grandma's Boy - Fred C. Newmeyer

Always the mama's boy, or in this case a grandma's boy, Sonny joins a posse after a tramp accused of robbery and murder. He is unable to conquer his cowardice until Grandma tells him of his grandfather, also a coward, who overcame his fears with the help of a magic amulet. With new courage (and the charm), Sonny captures the fugitive and becomes the hero of the day.