The son of Connor and Moira Rossa, Jeremiah was born in 2353 at the Galen IV colony. Jeremiah's parents were both killed during a Talarian attack on the colony during the Galen border conflicts in 2357. However, he was subsequently adopted by the Talarian officer Endar, who treated him like his own son and gave him the name "Jono". While living with Endar, Jono fractured his ribs, arm, and sustained a concussion, all attributable to childhood accidents, rather than child abuse.
He was rescued by the USS Enterprise-D in 2367 from a disabled Talarian observation craft. When Captain Jean-Luc Picard discovered his identity, he tried to bring out Jono's Human side. Jono at first responded, but later tried to murder Picard by stabbing him with a d'k tahg. He did this hoping he would be put to death and would not have to choose between his Human side and Talarian side. He finally decided to stay with his "real" father, Endar. (TNG: "Suddenly Human")