There is no concrete evidence in the game but I think personally that all signs point to that being the case. Moombas refer to Squall as Laguna and they can recognise beings by their blood, so that points to that same conclusion. As well as that Squall is always Laguna in the dreamworld. Theres several other pointers but I forget them for the moment.
It would be the ideal outcome if that was the case as the relationship between Squall and Rinoa reflects the short relationship that their parents( Laguna and Julia) had as shown in the first dream sequence. And yes I would think that would point to Raine being Squalls mother.
Bookmarks