Melbourne, Fla.-- A Florida MISSING CHILD Alert has been issued for Kiah Firth, who was last seen wearing an all pink sundress with flower print and Kristin Firth, who was last seen wearing a dark blue sundress with a belt and a bowtie in the back. The children were last seen in the 100 block of West University Boulevard in Melbourne, Florida. The children may be in the company of James Firth, last seen wearing a black V-neck sleeveless shirt, black pants and black shoes and Mai Firth, last seen wearing a multicolored flowered dress and a black coat. They may be traveling in a 2002, silver Lexus SUV, FL tag number 612PGW.