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Just b urself! Its the best thing u can do… 
.. Good Luck :k:
It seems you have known the person for a while, but are only nervous to meet his family. It depends entirely on your personality. But generally it helps to keep a low-key attitude, and don’t come across as too bubbly or too dazed. They also would know that u r nervous and if u just maintain a smiling, friendly persona, that should do for the first meeting.
Though its slightly off-topic, but many of our members just recently finished trashing the whole process of guy’s-folks-visiting-the-gal-to-check-her-out. 
Enjoy reading.
walekumsalam yaar and BEST of luck :k: hope it goes well inshallah :k: dont be nervous!
Agree with Faisal
W-A-assalam...
Good for you....!!
Well don't be loud.... keep a low profile ..... Let them get to know you slowly because families... unlike the guys can be rather over critical....!! Why antagonise them unnecessarily?????
Is this an arranged marriage thing.
Just be yourself, and give him................:-P
.......reason to feel lucky. :)