My parents came to US on April 5, and authoried to stay with us until Oct.4. Because their visa will not expire until next March, how can we extend their stay in US while, with no vilation of the half-a-year permit. Somebody said we can pay a short visit to Canada or Mexico. Is that applicable? Should they get the visa from those countries in advance? Because our baby need their babysitting, we really want them to stay for a longer period. Thank you so much._(c) _(b)