@Henry855 @Katharine10
As @Sarah977 mentioned, you would have (3) Listings
Parent (both bedrooms)
Child 1 (bedroom one)
Child 2 (bedroom two)
For the one bedroom listings I would lock off one of the bathrooms.
Multiple Listings
The cautions are you need to be able to lock-off areas that are not used (bedrooms/bathrooms) on the smaller listing(s) and need to sync the calendars to prevent double bookings. Be sure you have an efficient "team" and system to keep track of what rooms should be locked/available for each booking. Be sure to make it clear on the smaller listings what bedrooms, bathrooms (and any other room) that will not be available when booking the smaller listing. Ensure your smaller listings only show photos of the bedrooms/bathrooms they will have access to. I usually suggest it also be mentioned in your message to guests after booking (many guests don't read the listing properly).
Multiple Listings Same Property
https://www.airbnb.com/help/article/289
Calendar Sync Cautions
Bookings on one listing will automatically block the others if synced correctly. However, if you want to use the property for personal use, you have to manually block ALL the listings, as blocking dates on one calendar will not block the others. This is intentional in order to allow the Host to block the smaller listings in favor of the larger (2bedroom) listing.
To answer @Henry855 's question...yes; some Hosts keep the larger listing open on weekends and Holidays (block the smaller listing(s), in the hopes the larger gets booked first. If the larger doesn't get booked, they might unblock the smaller listing(s) close to check-in date.
Professional Tools
https://www.airbnb.com/help/article/2499
