The middle of somewhere

Ronnie and her hyperactive brother are pawned off on their grandfather while their mother recuperates from an injury incurred from chasing a squirrel. Their grandfather, Pop, is off on an adventure in a camper, seeking a way to get rich using the wind. Ronnie's brother, Gee, is a handful and Ronnie spends most of her time keeping him from killing himself or destroying the world. Just when Pop is ready to turn around and return the two kids to their mother, Gee disappears and the search for Gee helps Pop and Ronnie become friends.