Is the fingerprint password restricted to me alone, or could another family member also use a fingerprint password to open my phone if I agree?
I’m not sure which phone you have. My friend has a Nexus 5x, and we were able to add my finger print so I could open her phone.
edit - we also added more than one finger print for my friend in case she injured her primary finger.
Every phone I’ve used with a fingerprint scanner (Android and iOS) allows for input of multiple fingerprints from multiple people. They also use either PIN or password backups, so it’s best practice to set one of those also. In many cases, after a restart a phone won’t accept a fingerprint scan to unlock the screen until after a PIN or password is entered first.