It's against Airbnb's T&C to accept third party bookings. The guests staying haven't signed up to your house rules. Airbnb won't necessarily be able to help you if there are issues. You won't know if the person staying has previous negative reviews and you can't share information with them directly @Vivian1468
I would have suggested the parents set up their own account.
now you will see other hosts take third party bookings but personally I don't think it's worth the risk.
you will have to asked the person who booked to share the information