Dear Mededit,
Wow! This sounds very difficult and scary. You have to tackle things on many fronts, and I am not sure what should come first, so I'll just throw out some suggestions.
You can file an anonymous report with the state department of motor vehicles expressing concerns about your dad's driving safety. This will, hopefully, trigger a required re-examination.
There is a great book called The Parent Care Conversation that might give you some ideas about how to get started discussing these things with them.
Is your dad aware of the changes in your mom? You might want to arrange a visit and spend some alone time with each of them to assess things more fully. Maybe your dad is open to the idea that your mother needs a medical evaluation - remember that many forms of dementia can be due to infections, vitamin deficiencies or other reversible causes.
Even rural areas may have a dial-a-ride program. Call your county offices and see if one is available and what the eligibility requirements are.
If your father has a doctor, you can talk to the doctor about your concerns. Even though the doctor can't share information with you without your dad's permission, you can write the doctor a letter to describe your concerns about dad's driving. You can also mention concerns about mom, so that if she accompanies dad to a doctor's appointment the doctor can observe her as well.
Lastly, look for a caregiver support group in your area or theirs, because the facilitator and members will have great suggestions and strategies and will know the local services.
As I have said many times in the last 2 years of caring for my father, I have become knowledgeable about so many things I never thought I would! I appreciate the chance to share some of my learning with you and I hope it is helpful. Please keep us updated about how you and your parents are doing.
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