They are aware that she accepts his invitation to apprentice with him, & of course they’re pleasantly baffled & very proud … but she has a sort of surface level relationship with them, and doesn’t often return home. As for her romance with Vicon, Juliette actually keeps the fact that they’re together contained to the Spire…very very few outside people know about it or how they met - many years down the line, the general public is aware of her as a member of the sorcerer’s court but nothing more.