Lysa Vos was the first and only daughter of Jedi Masters Xander Vos and Mia Romis, and the twin sister of Ben Vos. Lysa was named after Xander's mother Lysa Sornfree. Lysa trained under Jedi Councilman Lyn Korak, a close friend of Xander, and a man who had been involved in the training of Ben as well.