Wis. Stat. § 48.28: Failure to obey summons; capias.

If any person summoned fails without reasonable cause to appear, he or she may be proceeded against for contempt of court. In case the summons cannot be served or the parties served fail to obey the same, or in any case when it appears to the court that the service will be ineffectual a capias may be issued for the parent or guardian or for the child. Subchapter IV governs the taking and holding of a child in custody.