Choose Your Own Adventure

OK, so I'm at my gynecologist's office for an 8:15am appointment. When I arrived, there was an older couple sitting in the waiting room. Older, like, 70s. They looked tense. I assumed maybe it was some kind of cancer diagnosis result day - because clearly they're beyond the age to have children.
About five minutes later, in walks a pretty younger woman (I'll give her 30), not visibly pregnant, with a younger guy. They greet the older couple, hugs all around, and sit with them. They do not check in. I think - oh how cute - I bet they're getting a sonogram and want the grandparents to be there. Small talk ensues - though they're not especially chipper or elated.
Some time goes by.
Another young woman walks in, walks up to the counter and checks in. She turns around, timidly says hello to everyone, hugs the OLD GUY ONLY, says, "I'm not sitting down," ...and dashes off to the restroom. Younger guy calls after her: "Why not?" Then looks at everyone else, shrugs, and sits down. Sadly, that's where the story ends. I got called in, and didn't see them again.
Congratulations - if you've read this, you're in the Choose Your Own Adventure mode about this group like I am. Theories??