If he answered those, they would spoil the rest of the game, so he can't, that's why he answered that you'll need to play to find out, since he doesn't want to spoil the game.
But I'm fairly certain that Ashe is Mila's mother, and that Ashe is like Half Vampire/Half Human (the cloaked woman is Ashe's human half I think, and the personality shifts a bit between forms)