If someone else is driving your car and gets a DUI, how does it affect you?

Your son's DUI should not affect either you or husband. However, if your insurance carrier becomes aware that your son received or was convicted of a DUI and he is listed as a driver of your car, your insurance rates could increase or you could be dropped by your insurance carrier. Your son will have to deal with his DUI and all the consequences that come with it, including license suspensions.

Well your insurance rates are going to go up unless he moves out of the house. He needs to get a good lawyer.

It does happen fairly often. Generally the liability for the offense falls on the driver, not the owner. If he caused any injury or damage to property as a result of his drunk driving, then your insurance company should be involved. If on the other hand you let him drive with any knowledge that he was likely to get drunk and drive, and if he is underage, you may have some liability. Perhaps your husband has a good point in not permitting your son to drive his car, You might want to do the same, or get a no-alcohol-if-driving pledge from your son, and if he is young enough, ground him from driving for enough time for him to feel the loss. Good luck.

Yes. The car gets impounded.

This will impact the cost of your insurance, but otherwise you will be unaffected.

Yes, this happens commonly. Your son will be charged, should hire an attorney and attempt to mitigate his damages. As for you, your insurance will either be cancelled, increase in cost exponentially, or your son will be excluded from coverage.