The book by Steven Hassan is called Releasing the Bonds
but the information in it is only good if someone is in contact and can talk to the cult member. It does give some things to do if the person is cut off but it's not that effective.
Marc Headley as Blownforgood had a method he said worked to get people out of the sea org. If disconnection has happened this may do the trick. Depending on circumstances the method may have to be modified to suit. You'll find his thread on this here:viewtopic.php?f=9&t=24066&p=277658#p277658
$cientology's sea org has moved people around to keep family members from making contact. In some instances they will send them to another country.
Tunes, I recommend you do NOT divulge any information about what is going on with your family member or anything about them on this message board. If you must give updates on what is going on keep them vague and misleading. $cientology's office of special affairs monitors this message board.
I do look forward to your update that tells us your family member is out. By all means post that when it happens.