Standard travel insurance policies are rarely suitable for such a long stay, as most of them limit the duration of a single trip to 30–60 days. To ensure a worry-free visit for your parents, the article at https://incrediblethings.com/money/grabbing-visitor-health-insurance-plan-many/ explains the key considerations for choosing a reliable travel insurance plan that covers unexpected complications and neighboring countries. This protects you from massive out-of-pocket expenses abroad.