Radič was the son of Sanko Miltenović, the eponymous founder of the House of Sanković (the progenitor was Dražen Bogopenec, a lord of Hum under King Stephen Uroš II Milutin of Serbia, fl. 1306). He and his brother Beljak inherited the lands of Nevesinje and Popovo Polje (in Herzegovina) and part of Konavli (southernmost Dalmatia) upon the death of his father. He had brothers Beljak, Budelja, Sančin and sister Dragana. In 1388, he and fellow nobleman Vlatko Vuković led the Bosnian army against the Ottomans at Bileća.