MY ETHER Wallet

Few years ago my ex father in law and I put 22 ETH in my ether wallet (MEW), because Trezor did not support it. But now he does not remember the pin code and he does not have the seed phrase. I think he Did not write the MEW seed phrase.

Are there something to do it? We can enter with the trezor seed phrase? Or he lost it Forever?

Thank yoy in advance

No DM