Questions at the airport for old age parent returning to USA with a Re-Entry permit

Hi,

Background: Old age parent left U.S.A in Jan/2016 with a Re-Entry permit that allows for return by Jan/2018 (2 years validity of Re-Entry Permit).

Questions:

If the old age parent returns sometime in 2017 (and not in Jan/2018) by staying for a little under two years outside U.S.A, following questions come to mind:

  1. What questions can be asked at the airport when an old age parent returns to the USA with a Re-Entry Permit ?
  2. What documents should one have when returning to the USA within 2 years of Re-Entry permit ?
  3. Any other thing that we should keep in mind ?
Thanks
 
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