Do your homework
Try to find out as much as you can about your girlfriend’s or boyfriend’s parents before you go. Are they liberal or are they conservative? Do they like gardening? Does dad like firm handshakes? Do they hate smoking? Ask your partner about their passions and interests and also ask if there are any issues they are particularly stiff about, so you can prevent the whole foot-in-mouth syndrome.
Meeting the parents is similar to the first date you had with your loved one. You put on your best behavior. You feel overwhelmingly self-conscious and you’re totally unable to relax. This homework might just instill the right measure of confidence in you.