Visa only says within what time you can enter US for how many times. In your parents' case, they can enter US for multiple times within one year. This part is controlled by State Dept.
But how long they can stay is determined ONLY by immigration officers at the entery port. Usually 3m~6m. This part is controled by Dept of Homeland Seceurity, CIS. See, this is a different Dept.
But how long they can stay is determined ONLY by immigration officers at the entery port. Usually 3m~6m. This part is controled by Dept of Homeland Seceurity, CIS. See, this is a different Dept.
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