A good headphone for old man

Your problem is very difficult but there are many possibilities for your father to make him listen TV's sound. Every TV has output AV panels. You can use woofer for loud sound if possible, or if it is not possible you can use short distance wireless FM microphone in stead of distance sound. But you need a mini fm radio or wireless fm sound cathcher too. The wireless microphone can be made mini fm transmeter if you connect TV's speaker to wireless micro phones speakers with similarly connect each other. If you do this, your father can listen tv's sound clearly with stereo FM quality without disturb to others. I think you will do this.