Jocelyn Treadway (neé Jocelyn Darnell) was born on March 11, 2227 in Georgia, North America on planet Earth, not long after the birth of Leonard McCoy and not long before that of Clay Treadway. After Treadway's birth, the Darnells and Treadways informally betrothed their offspring to each other. Leonard McCoy enrolled in Medical School in 2245, although he did his studying in his home in Georgia. Jocelyn and Leonard finally married in 2248 and had a daughter, Joanna McCoy around 2249. Clay Treadway left Darnell's life (and presumably Georgia) shortly after her marriage.