I came across an interesting fact(well maybe) during my latest ongoing play through of FFVIII. At the beginning of Disc 2 where you are playing as Laguna in Windhill I noticed something interesting. When you are talking to Kiros in Raine's pub there is an option during the conversation how is Julia (or something to that effect). Kiros then tells Laguna she is with a guy named General Caraway ie Rinoa's father.
So the question is does anyone else like myself reckon Julia (the piano player turned singer from the Deling City Hotel) is Rinoa's mother?