I'd wait a few weeks for things to settle down and see how this all plays out.
on your daughter / granddaughter - be aware the issue is whether they CAN BE listed as your dependents; not WERE they listed. Do you see the nuance? if they CAN BE listed, whether they are or not they are listed, your daughter (presumably over 16) is not eligible for the rebates -either the $1200 or the $500. However, the granddaughter should qualify you for the $500 as she is a qualifying child (under 16).
the IRS is required to send a letter explaining everything - I'd just be patient as at this point 'what is done is done'.
