well, i managed to get them to stay together. i don't think they're very happy though. also, i think that very little of what i type in affects the game at all. here's a partial transcript of my "generated stageplay":

GRACE
Andrew, I know what you're hinting at...

ANDREW
lalalalalala

GRACE
about me...

GRACE
Do you two want to hear the honest truth? Huh?

GRACE
Andrew, do you want that?

ANDREW
let's eat

GRACE
No, Andrew, just, yes or no, do you want to hear the truth?

(ANDREW comforts grace.)

GRACE
Trip?

ANDREW
i'm hungry

TRIP
Yes...!

facade is crazy. i've played one round so far. i thought they didn't hear what i said at all, because they almost never responded to me. but then, a little way in, trip said "oh, i've heard what you've been saying tonight" and then pretty accurately listed off a few things i said. the ai can't be that good - they haven't made a program that can come close to passing a turing test yet, i don't think. still pretty impressive. something about the gameplay is really engaging, in a way i didn't find with adventure or zork.