i doubt it's shens.
for all those "but there are fingerprints!" people, cops don't just have sets of your fingerprints on the ready just in case. they need a reason to take them in the first place. the dwi was the reason to get the fingerprints. now, on the op's record, he's got his brother's fingerprints as his own.
i think all you'd need to do is go to the courthouse, tell them that you have things on your record that you never did. get copies of all the paperwork (tickets with signatures as well as lots of things with your own signature dated before and after the events in question), a new set of fingerprints for your record, and hire a lawyer to get it expunged from your records. bill it all to your brother.