(1)    Two parts. The trial shall be divided into 2 parts, the first part dealing with the determination of paternity and the 2nd part dealing with child support, legal custody, periods of physical placement, and related issues. The main issue at the first part shall be whether the alleged or presumed father is or is not the father of the mother’s child, but if the child was born to the mother while she was the lawful wife of a specified male the prior issue of whether the husband was not the father of the child shall be determined first, as provided under s. 891.39. The first part of the trial shall be by jury only if the defendant verbally requests a jury trial either at the initial appearance or pretrial hearing or requests a jury trial in writing prior to the pretrial hearing. The court may direct and, if requested by either party before the introduction of any testimony in the party’s behalf, shall direct the jury to find a special verdict as to any of the issues specified in this section, except that the court shall make all of the findings enumerated in s. 767.89 (2) to (4). If the mother is dead, becomes insane, cannot be found within the jurisdiction, or fails to commence or pursue the action, the proceeding does not abate if any of the persons under s. 767.80 (1) makes a motion to continue. The testimony of the mother taken at the pretrial hearing may in any such case be read in evidence if it is competent, relevant, and material. The issues of child support, custody and visitation, and related issues shall be determined by the court either immediately after the first part of the trial or at a later hearing before the court.

   (2)   Jury size; verdict. If a jury is requested under sub. (1), the jury shall consist of 6 persons. No verdict is valid or received unless agreed to by at least 5 of the jurors.