iPad

Hi, I’m message on behalf of my uncle… he has a iPad giving to him by his son and he is now in a different country but the iPad’s iCloud is in email which he does not remember the password too and the phone number that was registered along with the account no longer exist as he now has an American sim/phone. And my uncle can not log into his own iCloud on the iPad as it is asking for a password for the old email which we do not know the password of, I am wondering is there any way of removing the email and letting him log in with his own apple account without having to wipe the iPad

thank you help is much appreciated