I am in contempt of family court for missing a hearing and a warrant has been issued. Has my Passport been revoked?

I can't tell you about your case specifics, however in another case I had with a civil warrant for contempt, the client did indeed leave the country and re-enter without being detained because the civil warrant was not in the NCIC system. So, it is possible you might be stopped leaving the country but no one can tell you for sure. Your passport is not revoked though the Court could order you to turn it in to the Court.