I think bringing flowers is an ok gift if you're a girl, but if I invited a guy to Thanksgiving and he showed up with a floral arrangement/centerpiece whatever, my parents would think that he was totally weird. That's just my opinion though. I'd echo OtterXO's statement and say bring a nice gift basket. They're already going to have a lot of food and drinks, since it's Thanksgiving so give them something they can enjoy on a different day. Good luck!
