Am I considered a working cl, middle cl, or lower-middle cl?

My parents are both table-games dealers in a casino. (I reside in Las Vegas, Nevada) My parents income together is $75,000 - 80,000 a year. I am currently a freshman in college while working part-time at this restaurant. We live in nice 2-story house and have semi-luxurious cars. (My mother drives an Infiniti G35, my dad drives a Lexus ES, and I drive a Volkswagen Jetta.) If I missed any details, I'd be gladly to share.