Yes, each authorized user you add to your Family account gets their own separate account, with a unique account number, debit card number, budget, and qubes.
Only your account companion shares your account number and your qubes. At this time, shared qubes with your children or other authorized users (aside from your account companion) are not an option, but may become available in the future.
For more details on Family Accounts, click here or reach out to Customer Support.