Sec. 4. (a) Whenever a domestic relations court is established under this chapter, the domestic relations court has jurisdiction over all proceedings in the following causes of action:
(1) Dissolution of marriage.
(2) Separation.
(3) Annulment.
(4) Child support.
(5) Paternity.
(b) A domestic relations court has jurisdiction that other courts in Indiana have over the causes of action listed in subsection (a). A domestic relations court may dispose of the causes of action listed in subsection (a) in the manner provided by statute for those causes of action. However, this chapter grants supplemental powers to domestic relations courts to aid the court in determining the difference between the parties and in protecting the welfare and rights of the child or children involved.