Manners have fallen by the wayside these days in a lot of cases, but it's time to break out your best ones when you're meeting your boyfriend's parents. Believe it or not, something as simple as remembering to say "please" and "thank you" can make a big difference in the impression that you make.
Make sure you're on time. A little early is OK, but way too early is awkward, especially if they're making dinner. Being late makes it look like you couldn't be bothered to get it together. If your boyfriend is taking you and tends to be a slowpoke, press him to get ready a little earlier.
When you're introduced, address his parents as "Mr. and Mrs." If they insist you call them by their first names, that's fine, but don't make assumptions. Be prepared for everything from a handshake to a hug. If you're at dinner, it's time to remember your table manners. Sit up straight in your chair, use your napkin, hold your fork correctly and ask for food to be passed instead of reaching for it. On the off chance that your meal is formal enough to require to use of many pieces of silverware, make sure you know when to use each piece ahead of time.