yes, if you are arriving at the same terminal -- which I think you will (both at T1). You are not forced to go through immigration right away. Your parents can wait for you just outside the line, where people are filling out forms. The only issue is your plane is delayed. Using mobile phones is in principle not permitted in this area but if you are not yet in line I imagine no one would complain too much, so you could call them if they have a US mobile phone. Unfortuntely they'd have no way of knowing if your plane is delayed, there is no arrival information in that area.
yes, if you are arriving at