In many states a DUI or DWI will stay on a driving record for a set number of years, no matter if the person was a minor when they made the violation or not. For example in California it is typically 7 years, in New Mexico it is 25 years and in Georgia it stays forever on the driving record.

The state in which your nephew lives might have different laws than the ones mentioned here so check with the department of motor vehicles to see how many years it will stay on your nephew's record and to see if they have different rules for this if the DWI was received as a minor.

If the DWI continues to be on his driving record than it will likely affect his auto insurance rates by putting him in a higher risk category. If he needs to shop around for new insurance he can get a car insurance quote here.