Upfront, I must tell you that these types of motions are not generally successful, and often cause judges to react negatively. The first step would be to motion the case up in front of the sentencing judge, who in most cases will be the judge who presided over the trial, and ask for a modification of the sentence. You will have to notify the prosecutor and then “writ in” your son from whatever penal institution he is serving his time in. This is costly and time consuming for the state, so...