How can a civil case be made against mother of child by father who had no idea the child was his and state demanded paternity test?

A father can file a civil case against the mother for various reasons, such as seeking child support or custody after establishing paternity through a court-ordered paternity test. If the father was unaware of his parental status, he might argue for modifications in child support based on his situation, or he could potentially seek damages if he believes the mother withheld information that caused him harm. The specifics of any case would depend on the laws in the jurisdiction where the case is filed. Legal advice from a qualified attorney would be essential in navigating these proceedings.