Originally Posted by
BA Humbug
I would speak to the dnata transfer desk when your parents get there. I think they transfer your baggage for a fee without you having to go landside. Can't remember the exact price.
They shouldn't need to do this is if the luggage is already checked through by BA, which it should be on one PNR. The advice from the hotel is likely generic advice given on the basis that BA (a) does not through-check on separate tickets and (b) does not have many genuine through-ticketed pax going via DXB. But the OP's ticket is an exception to that (presumably one booked with miles).
(Others please correct me if I'm wrong and there is something unique about BA incoming procedures at DXB.)