If you stay beyond 30 days then you have to get a US visa to come back unless you have valid entry visa, which in your parents case is not a problem because they have multiple entry visas.
30 days is for those visa holders who no longer has a valid entry visa such as F1 (eventhough their I-94 is still be valid), then unpon returning from canada or mexico for a short visit, they can return US without first obtaining another valid entry visas. It is called automatic revalidation. If you are still confused, google the term.
30 days is for those visa holders who no longer has a valid entry visa such as F1 (eventhough their I-94 is still be valid), then unpon returning from canada or mexico for a short visit, they can return US without first obtaining another valid entry visas. It is called automatic revalidation. If you are still confused, google the term.
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