Boss tells you that the son she had with the Sorrow was taken away after she gave birth on the battlefield. She then shows you her snake shaped scar. You know what else the game shows you during this scene?
OCELOT'S ******** CHARACTER PORTRAIT!!!
Kojima spelled this out because he realized people were stupid shits after MGS2.
Some interesting parallels... at least I found them to be interesting:
Boss to Naked Snake before their final battle:
One must die and one must live. No victory, no defeat. The survivor
will carry on the fight. It is our destiny... The one who survive will inherit
the title of Boss. And the one who inherits the title of Boss will face an
existence of endless battle.
Big Boss to Solid Snake before their final battle:
Whoever wins, out battle does not end. There loser is freed from the
battlefield, the winner must remain there and the survivor must live his life
as the warrior until he dies.
