They could have had him added as a 'child' in the family settings > If you have an iPhone, iPad or Apple Vision Pro with the latest version of iOS, iPadOS or v

They could have had him added as a 'child' in the family settings > If you have an iPhone, iPad or Apple Vision Pro with the latest version of iOS, iPadOS or visionOS and two-factor authentication turned on for your Apple ID, you can change the Apple ID password for a child account in your Family Sharing group. > Tap Settings > Family > your child's account. > Tap Apple ID & Password. > Tap Change [Child’s Name] Password. > Enter your device passcode and follow the onscreen instructions. https://support.apple.com/en-gb/101567 https://support.apple.com/en-gb/101567