Your best bet to influence the course of this case is to talk to the prosecutor handling it. The state takes over a case once it is charged. Only the prosecutor can make the choice as to whether dismiss the charges. If your father is convicted, the prosecutor will make a sentencing recommendation that may or may not include jail. I've seen many cases where the victim talking to the prosecutor influenced the outcome.
Talking to your father's attorney can be a way to give him or her useful information that can be brought to the prosecutor to influence a dismissal or reduced sentence recommendation. I've also had plenty of cases where information that I received from the victim was crucial in negotiating a plea or defending the allegations.
Be polite and assertive. Tell them what you want and why. The attorneys will usually respond well.
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See my AVVO Legal Guide on Domestic Violence Overview. His attorney might be willing to talk with you as a potential witness for him. If you want more detailed legal advice, it would be best to schedule a paid brief (one hour) consultation with a DV attorney.
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