Meeting his critical family?... Help please?

Okay so my boyfriend and i have been dating for a few months now but we've known each other since we were kids for about 11 years now I know his parents and we have talked a little bit but I've never really really spent time with them just because of distance and either them or me not finding the right time but now in November his family from puertorico is coming down and his mom and my boyfriend have talked about me a lot so they allllllll wanna meet me.... I usually wouldn't be nervous because I as well am puertorican but the difference is is his family is very critical and it seems like if u do one thi wrong they automatically don't like you.... Are there any tips I should do to help when that time comes? How should I greet everyone ? I just want everyone to like me & I don't wanna try to hard but come off as not trying at all.... He met all my family and they alll love him but then again my family is accepti towards everyone & his isn't.... Please help with tips