What's the general rule with driving a relatives car?

In the United States, I'm driving my moms car since I'm having mine worked on soon, it's recommended that I don't drive it unless i have to. Basically the mechanic said not to drive my car unless I have to, so been driving mom's car for the time being. Mine goes in 6-1-22

We both have the same last name and she has insurance and the car is registered. She just hasn't been going out as much.

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Shannon27 · M

Doesn't the place that is working on your car give you a "loaner" to use if yours has to be left overnight? I don't have a vehicle but when my father has had to leave a car overnight the dealership gives him one to use. He has to bring it back with a full tank of fuel but that is the only charge. Could that be the difference? Was the mechanic at the dealership or at his own business?