hmm all depends. but politeness is NEVER the wrong way to go! moms can be tough. so make sure she knows that you treat her son with RESPECT! moms don't want to see their sons with a whiny gf. so make sure to say please and thank you to your man too. dress more on the conservative side. be bubbly and brainy. offer to help but don't push it! if they decline say "oh are you sure?" then if they say yes. then let it be! don't get drunk. don't smoke around them. doooonnnnnt cuss. really good luck!
when i met my bf mom we all got drunk together and me and my boyfriend kinda like made out in front of her, it was akward lol...good times..
she is what poeple call a "cool mom"....i love her....