Can more than one person's fingerprint be registered to a device?
Yes. Westpac does not collect your fingerprint details. Your fingerprint is stored on your device when you set up your fingerprint enabled device.
Just like it is your responsibility to keep secure your Online Banking Password, the fingerprint sign in option should be treated with the same level of security. This means that you must not register for fingerprint sign in if you would like to have other people's fingerprint stored on your device.