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The Attorney has ethical and professional obligation to be truthful to the tribunal. However, whether “Hep C” can be contracted from casual contact and thus whether your husband is contagious and danger to the child would be matters for medical Experts hired by both parties to tell the Court, to educate the Court on. In any event, the Attorney did not commit defamation against your husband even if the information to the Court is false because the information is provided to the Court, a privileged party entitled to receive the information.
In order to prevail in a defamation suit, one ("you") must be able to prove all of the elements of defamation. Generally, you must be able to prove (1) that a defamatory statement was made against you; (2) that there was a unprivileged publication of the statement to a third party; (3) if the defamatory statement is a matter of public concern, fault amounting at least to negligence on the part of the publisher—this would not apply to you if you are not a public figure; (4) then finally you have to prove that you suffered damages as a result of the defamation. As you can see, your husband would not be able to prove all the elements of defamation and thus cannot prevail in the lawsuit. Nonetheless, the Court may take action against the Attorney if the Attorney lied to the Court. However, making a statement that someone has Hep C that may be transmitted to a child is not a lie, but a statement that can be rebutted by a medical Expert.
You are quite Welcome! and thank you very much for your understanding.
Have a wonderful day!