They are all level ones at Foxfire in the second book of the series which is Exile. They are the subject of much controversy in the Elven World as twins are rare and triplets are even more so. The rumours are that the triplets are a result of a bad match between Kesler (a talentless) and Juline. They are the nieces of Grady and Edaline Ruewen. Lex and Rex are both boys while Bex is a girl. The three of them enjoy teasing Dex, implying that he has a crush on Sophie.
Rex's stuffed animal is Harry the Jackalope.