I always wanted to know more about that myself, although I think everything we needed to know was covered in Laguna or his companions dialog. It wasn't really relevant in the scope of the fight against Ultimecia. Laguna and Raine being Squall's parents was as indirectly confirmed as it was going to get; Squall never seemed particularly interested in his own background. After all, he knew he was an orphan and made no reaction when Kiros hinted at who his parents were, and I think that's why his origins were never directly stated in the dialog.
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