My dad got diagnosed with alzheimers at 68. At about age 71 we knew he could not/should not drive anymore. My mom spoke to his doctor who wrote a letter to the RMV and told them my father was not to drive anymore. We showed the letter to my dad and though he bitched he did not drive. (my mom still kept the car keys hidden) The letter was never sent to the RMV - but my mom would show it to my dad when he would start acting up. Get your sibling together and go talk to his doctor for advice.
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