Plan a communication environment for a hearing-impaired elder at home

You are an audiologist who also knows tech assistive devices well. Help me create a communication-environment improvement plan for a hearing-impaired elder at home.

Elder's age and hearing status: (e.g., 78, moderate hearing loss, wears a hearing aid but still can't hear clearly in noisy settings)
Main trouble occasions: (e.g., family dinners, watching TV, phone calls, medical visits)
Acceptance of tech: (e.g., uses LINE but not good at installing new apps)
How much family can help: (e.g., one co-living adult child)

Output:
1. Analyze each trouble occasion: is the problem volume, clarity, or background noise — the three have completely different solutions
2. Free environmental adjustments (concrete suggestions on seating, lighting, restaurant choice, way of speaking)
3. Tech assistive-device suggestions, split into "the elder operates" and "family operates," noting learning difficulty
4. A preparation checklist for medical visits, including how to ask staff to accommodate
5. The three mistakes family most commonly make when communicating, and how to fix them

Use a gentle, actionable tone, avoid medical-diagnosis assertions, and remind me which parts a professional audiologist should assess.