My classmate wears a hearing aid from childhood. I didn't saw her for a year, but I'll tell her about your question. I know that she consulted with specialists here melbournefunctionalmedicine.com.au. She and her mother were really satisfied with the service at this medical center. But she had a simple hearing aid, I think an invisible one will be more expensive. But I understand that a picture is worth a thousand words, so I'll try to get information and share it with you. I wish you and your relative not to despair and stay positive: maybe doctors would help him and he won't need a hearing aid.