If there was an accident when your child was driving under the influence, and if somebody got hurt, that makes the case significantly more serious and that does increase the chance that they will be punished in some more serious way. Also, although the juvenile record will also probably be sealed; and it wont be available to the general public, the DMV will have access to that DUI conviction, and they can use that to prevent your child from re-obtaining their license for some period of time, and they may be able to notify your insurance company of your child's driving history, which will make it much more difficult for them to obtain insurance, or will cause your insurance rates to skyrocket