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I assume his record is clean. If so I think you can expect the prosecutor to be helpful with you and your mother. It is likely in this situation that the prosecutor will simply want to take measure to prevent any future problems. This may include counseling, anger management, probation, banning weapons, or even temporary restricted contact. Since he has already had a taste of "shock incarceration" I think you will not see him put back in jail.
You and your mother should speak to the public defender and then the prosecutor and let them know about your concerns and wishes. They should both be receptive to you as you are in the best position to know the underlying problem that caused this outburst and hopefully how to prevent future problems (which is the state's first priority).
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Feel free to reply if I can help further.
Yes. However, the prosecutor will likely put the two charges together when settling the case with your father. I think you and your mother should attend both hearings... but coordiate with the public defender. The cases should have been consolidated in the beginning.