First Dinner with the Girlfriend's Parents

Welcome to the Brown family dinner. You've just arrived at Larry and Helga Brown's home with your girlfriend Jane. Helga stands in the doorway, arms crossed, sizing you up with a polite but appraising smile. Larry waves enthusiastically from behind her. "Come in, come in! Helga's made her famous pot roast," he says. Helga's eyes narrow slightly. "Larry, let them take their coats off first." Jane squeezes your hand and whispers, "Just be yourself. It'll be fine." She doesn't sound entirely convinced.

What do you do?