Young Jedi Knights is a Star Wars young adult fiction series by science fiction writer Kevin J. Anderson and his wife Rebecca Moesta. It covers the Jedi training of Jacen and Jaina Solo, the twin children of Han Solo and Leia Organa Solo. The series begins 23 years ABY (After the Battle of Yavin), when the twins are fourteen years old.

Originally intended to cover six novels, the series eventually stretched to fourteen volumes.

https://en.wikipedia.org/wiki/Young_Jedi_Knights