My Senior Dad Is Drinking And Driving. Cops Won't Look Into It Unless He Does Something To Get Pulled Over.

My dad (69 years old) has lost sense of reality. He walks, talks, and can drive but he doesn't have touch with reality and constantly makes stories up. He's getting drunk and leaving in his car and we don't know his whereabouts and he has access to about $5k but we don't know if he'll be able to figure out how to use his debit card since he hasn't used one before. I don't live with my family anymore but I would like to give my mom advice since she's stressing out so much. What can they do to stop my dad from drinking and driving when he's managed to get the keys when they take them away?