In the divorce court, the accused spouse will defend against child sexual abuse. The standard of proof is preponderance of the evidence. There the standard of proof is reasonable doubt. The rationale, of course, would be that if sexual abuse was not proved in the civil court under a standard of preponderance of the evidence, the district attorney could not expect to prove the act in criminal court to a higher standard, that is, to the more difficult proof without reasonable doubt. Reality does not always match a theory.
District attorneys have more expertise trying such issues than divorce lawyers.
The rules of evidence in a criminal court are different from the rules of evidence in a family court. In Massachusetts, the rules are followed, but the presumptions are in favor of the prosecuting district attorney in criminal court. In Massachusetts probate courts, however, rules of procedure and evidence are slackly followed. You must consult an attorney there. Depositions and subpoenas duces tecum are ideal for getting social workers' process notes, notes they must keep in order to stay in good standing with their board.