Sixth-grader Adam Jones' family tree, assigned recently as homework, fails to hold up to scrutiny, social-studies teacher Gwen Wexler reported Monday. 'I'm a little skeptical of Adam's claim that he's descended from [movie star] Vin Diesel,' Wexler said. 'There's also something suspicious about his tracing his mother's lineage to Cal Ripken Jr.' Wexler expressed further doubts about Jones' claim that he is related to actor James Earl Jones by way of 'the Zimbabwe Joneses.' 