Alicia is Clare's younger sister. Henry describes her as, "matter-of-fact and kind, but a little odd, absent" (1.9.44). She's a budding cellist, but not a very good one, it seems, which might have to do with the fact that her father is very critical of her, rather than encouraging. Alicia feels that he's just concerned with appearances and doesn't actually care about her, but Henry assures her that her dad does care. Alicia once saw Henry buck naked in the house, when he popped in from some time travel.