Trying to pass along my old iPad to my 90 yr old dad.. I forgot passcode

Hello,

I see you have a disabled mobile device.

When running a mobile device OS version lower than 15.2, follow the directions in this support article --> If you forgot your iPhone passcode - Apple Support

You may then wish to do the things in this article which may negate some of the things you need to do to deal with the forgotten passcode. What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

1.

If you stil have / know that old Apple ID, check your Apple ID via your email box, see this Apple article: If you forgot your Apple ID

If you forgot your Apple ID email address or phone number - Apple Support                  

OR see -> Having trouble signing in?

https://iforgot.apple.com/password/verify/appleid

See the following Apple articles:

If you can't connect or sign in to iCloud

If you can't connect or sign in to iCloud - Apple Support

Contact Apple for help with Apple ID account security

Contact Apple for help with Apple ID account security - Apple Support

2.

Then you need to read -> this Apple article: What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch -> What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

Then remove the iPhone from your account, see -> Check your Apple ID device list to see where you're signed in

Check your Apple ID device list to find where you're signed in - Apple Support

Then your dad can sign in with his own Apple ID.

3.

You can also contact Apple support for help, -> Get Support (apple.com)

You have to show proof of ownership of your product, provide all documentation showing your purchase of the device.

If you do not have additional proof of ownership, contact the reseller. They may be able to provide the original purchase document.

Once Apple receive your proof of ownership, Apple will further review your request and provide an update.

See also -> Keep your receipt after you buy an Apple device

Keep your receipt after you buy an Apple device – Apple Support (UK)