Republican National Convention is in NYC in August. The OP should do some research on dates for the convention and the FIL/MIL trip because while the convention is on, hotel rooms here are likely to be very expensive at all levels (from the protesters in the cheap hotels, through the media at the Hiltons of the world, up to the bigwigs at the Four Seasons, everyone will want a hotel room). If their trip coincides with the RNC I would advise looking around for favours to call in.