Kira Reon was the son of Kira Taban and Kira Meru and the younger brother of Kira Nerys and older brother of Kira Pohl. (DS9: "Wrongs Darker Than Death or Night")
Reon often played springball with his brother and sister. (DS9: "Shadowplay")
The young Kira Reon seen in "Wrongs Darker Than Death or Night" was played by an unknown actor.