PCB, I wanted to tell you this when we were "talking", earlier, but my silly internet cut me off.

I always called my first husband's parents "Mr. and Mrs. .........". I think this mostly because I met him in elemetary school and started dating in High School......could never have called them by their first names then!! LOL!! Scott's mom is called "Ann", her first name. Scott calls my parents by their first names, too. But.....you need to do the most comfortable thing for you, to start with, and as you get to know them better, then use the name that they want you to use and the best way to find that out is to ask them, yourself!!!!!