Another thing.For some policy. If your parents plan to stay 6 months, you would be better buy 6 months before they arrive. Don't buy 3 months and try to renew it after 3 months. Because if they got sick at end of 3 months the policy only has few days left. The insurance company will only cover these few days. If you renew it, the new policy wouldn't cover pre-existing conditions. So you are not covered even they are still sick.
