IPAD locked!

If the iPad passcode is forgotten, or the iPad is disabled, you’ll need to follow this:

https://support.apple.com/en-gb/HT211078

If your device is Activation Locked, this help page will provide most of the information that you’ll need:

https://support.apple.com/en-us/HT201365

If you have forgotten your AppleID or associated password, these can be recovered here:

https://iforgot.apple.com

To recover your credentials, you’ll need access to one of the following:

• Your primary email address mailbox that corresponds with your AppleID
• Any of the secondary/recovery email addresses that should be configured for your AppleID account
• Any of the trusted telephone numbers (fixed line or Cellular/Mobile) that are associated with your AppleID

Unless you AppleID account has not been fully/correctly configured, or has been seriously neglected, recovery of the AppleID and password should not be difficult.

More information about recovery of your AppleID:

https://support.apple.com/en-us/HT201354

More information about recovery of your AppleID password:

https://support.apple.com/en-us/HT201487

When you recover access to your credentials, you would be well advised to log-in to your AppleID account from a web browser - and verify/update any email addresses and trusted telephone numbers:

https://appleid.apple.com

If the screen shows disabled, you could restore the phone, but if it was set up by the ex, you would not have the information to activate the device. It would lock with Activation Lock, and without his Apple ID and password, you will not be able to unlock it and it will be useless. If you forgot the passcode on your iPad, or your iPad is disabled - Apple Support

What exactly are you seeing on the screen of the iPad? Does the screen show Disabled, or are you seeing a screen about Activation Lock? Did your mother purchase this iPad, was it activated with her Apple ID, and does she have the original receipt?

You're welcome.