Forum:How does Solid Snake know Big Boss is his father in Metal Gear Solid?

Ok, so how does Solid Snake know that Big Boss is his father in Metal Gear Solid. When he is captured in the cell after Ocelot's torture, there is a codec scene in which he talks to Naomi and he obviously knew Big Boss was his father. But I've watched videos of MG and MG2 and in Big Boss's dialogues, he never states that he was Snake's father that I can find. When he "dies" at the end of each of them I'm sure he doesn't say anythnig about being Snake's father. I really hate finding holes in the MGS series and this seems to be one. =(