When Papa gets religion to the extent of neglecting his family, Mama takes the children to live with her poor but expansive parents and their extended family. But then Mitty, ten, is sent to rich relations who can give her ""advantages,"" and most of this see-saws between the inhibiting refinements of their big house and the freewheeling merriment of vacations with the others--until Grandma on a visit sees for herself that the Bowmans' stiff, dark domicile is no place for Mitty. Young makes a bit too much of too little to entice the reluctant or sustain the special reader, but that middle range of voracious bookworms will find the standard blend of adjustment problems and late 19th-century San Francisco background sufficiently filling.