Wait. Don’t rush into meeting the family. Wait for the right time. Get to know your guy first. Once you’re sure that this relationship is ‘the one’ then mutually decide to meet the parents.
Research. Find out about his family beforehand. Know if his parents are divorced or if they’re both still alive, know if he’s part of a blended family, a huge house of a joint family or a nuclear one.
Venue. The right location is important. One good choice would be something neutral, like a restaurant. Choose one that is semi-formal unless you’re a pro at figuring out the cutlery!
Punctuality. Don’t you want to make a good impression? Don’t be late as it’s disrespectful to make others wait for you. Along with other things, you need to show his parents that you are a responsible adult.
Attire. Get as much information as you can from your mate. You don’t want to overdress or look sloppy. Stay away from miniskirts and anything that shows off your cleavage or underwear (bra straps in particular), see-throughs also should be avoided.
Conversation. So you dressed up real pretty, but do you have a mind? Then prove it but don’t go overboard. Try and not show off about your exploits and education. Try and involve all the members of the family. Be polite.