Troubleshooting

I've always bought the turbotax and my son and I share the software.  He has completed his taxes but when I now try to sign in to do my taxes, it says the license code is already linked into another account  error code 608.  This has never happened before.  I don't want to log into his account and therefore I assume we would be able to access each other's information?

help,

Maureen  / Mom