Quote from Denise in the episode Spoiler: Bert Gets Married
Denise: So what are we supposed to do? Stuart: I don't know. Look for a hut in a neighborhood with good schools? Denise: Oh, God. I forgot about our kids. Stuart: It's okay. Don't worry about it. They- They- They weren't real. They were projections from a malevolent force keeping us enslaved in a false reality. Denise: Yeah, but they were ours. Stuart: Yeah.