You would need to contact a civil lawyer who can handle a defamation or slander claim.  In order to pursue these types of claims you need to have monetary damages, such as the person who was falsely accused lost employment opportunities or had to hire a criminal attorney to defend themselves against the false charges.  Also, you have to consider whether or not, even if you got a judgement in a court against the accuser, could you actually collect on that judgement.  Meaning, does the Father who made the accusations have the ability to actually pay on a judgement.