This Apple article has instructions for what to do if you have forgotten your Apple account password, or the system does not recognize the one you remember —> If you forgot your Apple Account password - Apple Support
or go directly to this link —> http://iforgot.apple.com/
If you don't receive your verification or reset email, read this Apple Support article: If you didn’t receive your verification or reset email - Apple Support
"When you make certain updates to your Apple ID, we’ll send you an email to help you complete the update. For example, you might have reset your password, reset your security questions, or added a new email address to your account." Also check your junk mail.
If you find you can’t sign in, reset your password, or receive verification codes, you can request account recovery (read this support article: How to use account recovery when you can’t reset your Apple Account password - Apple Support ) to regain access to your account. Account recovery might take a few days or longer, depending on the specific account information you can provide to verify your identity. This is a multi-step process. More detail in —> Activation Lockout Issues - Apple Community and My Apple ID is locked, how do I fix it? - Apple Community
This page has telephone numbers for contacting Apple for support and service ➞ Contact Apple Support - Apple Support
If you are signed into this forum using the same Apple Account then your browser may be configured to automatically enter your password. You should be able to view stored passwords in your browser's preferences/settings.
You may wish to use ScreenTime to restrict what he can do on the device, similar to settings used for a child. Unfortunately Apple doesn't have guidelines for device usage for people with dementia, such as having the equivalent of a child Apple Account which allows another person ultimate control.
Set up Screen Time for a family member on iPhone - Apple Support
Product Feedback - Apple
