SECTION 1. Section eighty-six of Republic Act Numbered Two hundred and ninety-six is hereby amended to read as follows:
"SEC. 86. Jurisdiction of justices of the peace and judges of municipal courts of chartered cities.-The jurisdiction of justices of the peace and judges of municipal courts of chartered cities shall consist of:
"(a) Original jurisdiction to try criminal cases in which the offense charged has been committed within their respective territorial jurisdiction;
"(b) Original jurisdiction in civil actions arising in their respective municipalities and cities, and not exclusively cognizable by the Courts of First Instance; and
"(c) The last phrase of paragraph (e) of section forty-three of this Act, notwithstanding, justices of the peace and judges of municipal courts shall have concurrent jurisdiction with the Courts of First Instance in the appointment of guardians and adoption cases."