Mom's car and Dad's car used to be two cars, or one car with a clear rule about who drove it when. Now it is one car, and the first week of a shared plan tends to end with someone standing in the driveway with keys in hand. You can avoid that by sizing the plan on paper before anybody is late.
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Count the trips
Take a sheet of paper and write each day across the top. Under each day, list every trip the car needs to make: groceries, church, a doctor visit, a pickup for a grandchild, a visit to see you, errands for him. Put a star next to any trip that must happen at a fixed time. Those are the ones that decide who gets the car. Flexible trips can shift to a different day or a different driver.
Find the overlaps
Look for days when two trips need the car at once. A morning appointment and a midday grocery run on the same Wednesday mean one of them moves. Decide which trip moves, not which person gives up the car, so nobody has to be the one who said no. Ask him to help make this decision. A man who helped choose the plan is far less likely to fight it than one who was simply told where his car goes.
Decide what the car is for
Ask whether the car is still the right size for the trips you now make. A larger car may suit a family pickup, a smaller one may be easier to park, and some trips may be better handled by a ride service or a neighbor. Test each option against the star list, not against which car you like best.
Check who is actually driving
Ask whether he is still comfortable on the highway, in parking lots, and at night. Notice whether he gets lost on routes he has driven for decades. Talk to the insurance company about who is listed on the policy and who is allowed to drive the car, and ask them to confirm the answer in writing, since it depends on your specific policy.
What to do tonight
Write the week out on paper with the star trips marked. Count the days the car is needed by two people at once. Pick one schedule and run it for a full week, then fix the places where it failed. Do not try to design the perfect plan on the first night.
When to ask the doctor
If you notice he is getting lost, misjudging distances, or having trouble on the road in ways that worry you, tell his doctor what you have seen. Bring specific examples, such as the turn he missed or the light he did not see. The doctor can help decide what, if anything, needs to change.
Good-week card
Every trip has a day, and nobody is standing in the driveway with the keys.