Contact your atty as well as the police .. crossing state lines BIG BIG NO NO. You have to act quickly. If there is a parenting agreement in place that names you as custodial parent .. you are looking at kidnapping charges. As the sole custodian of my children .. for my stbx to take them out of county even that all has to be approved and he knows he's not back when he's suppose to be .. the police are involved .. end. of. story. DO call your atty and do not let more time pass .. if there is nothing in writing .. you better get something sooner than later. Hugs