"CANADA." By Richard Ford. Ecco. $27.99.Some parents screw their kids up incrementally. Bev and Neeva Parsons manage to cram a life's worth of trauma into a matter of days during the summer of 1960.The couple's misadventures are told by their son Dell in "Canada," Richard Ford's 10th book.The hapless father, Bev ("He never conceded that Beverly was a woman's name in most people's minds"), and the bright but empathy-bereft Neeva dominate the first half of a riveting tale of lost innocence.