[Hylas]

Clearly, Squall is Laguna's son. They're tied up together during the whole game, and here and there, without clearly saying it, there are details that make you understand Laguna is Squall's father, and Raine is Squall's mom.
I know there's someone who says it's not true, that there's not clear evidence of their connection, but if you really played the game carefully, and I did, there's no need for a scene with Laguna saying "Squall, you're my beloved son!" and Squall saying "Oh father!" and final hug