If the doctors say that he will never recover and should never fast till the rest of his life, he is exempted from fasting but he should feed a poor person for everyday missed, either by feeding him at the end of everyday or by gathering 30 people after Ramadan is over and giving them food at once. Each one needs about 1.5 kg of rice or he could cook food that is enough for them and invite them to eat.
If there is an organization that would feed these people and he trusts them, it is OK for him to send them the money.