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It's standard in the agreement between probation and parole and every probationer and parolee that they refrain from contact with people with criminal records. I have seen them prevent two people from marrying while on probation, from living together. I have seen probation and parole temporarily restrict access to family members. And all of this is lawful.
I'm not saying that you can't try to appeal to probation or, if this is parole, to the parole board, or even contact your son's lawyer get the case back before the sentencing judge to see if they will make an exception in your case. But your son's liberty will be 100% dependent on his compliance with what his PO requires of him, and judges tend more often to go along with probation or parole's decisions in this area unless there is a clear abuse of their discretion.