Probation supervised or unsupervised will probably have a reporting requirment of another arrest as a violation of the original probation.Failure to report an arrest while on probation is a violation of probation itself. Please have your cousin consult his/he original attorney for advise on how to proceed.Your cousin should not go to court without a Lawyer!
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His probation on the original DWI could potentially be revoked as a result of his second arrest. This of course would depend on the prosecutor handling the case and if they decide to revoke his originial probation.
I also agree with Vic, in that a failure to report the second arrest to the probation office could result in another probation violation.
In any case, your cousin needs to seek experinced counsel to help him through this and to potentially minimize any damge.