It seems like you’re disagreeing with my argument in a spoiler tag upthread, but you’re not directly responding to it. Using MUDs to introduce people to IF? Did you see that argument? (The spoiler tag makes it easy to overlook.)
Anyway, it’s not spoiling anything to say that the (dead) mother dies in the non-interactive intro of the game. The movie fade-cuts from her death to the little brother weeping at her grave.
We call that a “disposable woman,” a woman who dies as a plot device to motivate a male character.
As for the other woman you mention, in the most charitable light, you’d call her a “damsel in distress.”
We give these roles names because they are extremely common. They are not positive portrayals of women, especially because they are so common. (And let’s not forget the other portrayal of a woman in this game, which I think we can all agree is a negative portrayal.)
But, as I argued above, Brothers takes these tropes further by juxtaposing the (dead) mother and the damsel with male characters who can be trusted to help. (And then tosses in an achievement for being pointlessly cruel to a little girl, just to put a cherry on the cake.)