The word driver is more general - anybody who drives a vehicle is a driver. You are a driver when you are driving your car. Some people work as bus drivers and taxi drivers (the drivers of trains are usually called conductors).
A chauffeur is a person who is employed to drive a car for a private individual. Rich people and celebrities often have chauffeurs so that they do not have to take public transportation, or drive themselves.
All chauffeurs are also drivers; not all drivers are chauffeurs.
If your partner is ill, you are more likely to suffer bad health, suggests research from Harvard Medical School (those whose partners had a debilitating illness were more likely to die early). Nurse each other through minor illnesses so you both remain in good health and can benefit from two incomes for longer.