Be nice, respectful, treat their son good, look them in the eyes when talking to them even if you're uncomfortable with it it shows them respect, if they offer you something and you don't want it turn it down nicely like "no thank you." or something along those lines don't go "uhh no." or anything, don't be too afraid to talk about your life or anything, just be friendly and honest.
kaylas answer is good, but I would still like to say that somrtimes parents will never aprove im sorry :l but if ur love us strong & ur good at hiding that u dnt care wut thy th ink in front of them u will b fine :)
be very polite put on respectful clotes talk nicely always smile and say words like " thank you and please". be very friendly and cheerful and always smile at them
be your self .coz fake get busted trust me as long as you are honest with your self they are gonna like you
well the problem is that we both live long distance from each other so we r trying to figure out it