If the probation officer for your father has failed to return telephone calls that you have made on your father's behalf, you need to set forth a log entry of the times that you have called advising that your father is hospitalized.Keep a copy of this documentation for future need. I also suggest that you write the probation officer on behalf of your father advsing him or her of the hospitalization, the attempts to make contact with him or her keeping a copy of the letter for future need.In this letter toy need to specifically reference the last letter sent by the probation officer as well. You might also want to contact the probation officer's supervisor concerning the attempts to advise the probation department that your father is in a coma.Good luck.