My folks live 5 mins from DFW in Southlake. In either Grapevine or Southlake you'll pretty much have your pick of places to eat.
Tolbert's in Grapevine (on Main St) is a pretty laid back place that has good food.
The best Mexican food in Grapevine is just off Main St. is a place called Esparzas. Great food and the margaritas/swirls are deadly (don't drink more then 2)
If you're willing to drive a bit back up 114 into Roanoke I would HIGHLY recommend a place called Babes Chicken:
http://www.babeschicken.com/
During the week you shouldn't have any problem getting a table but the place is packed on the weekends. Homemade chicken fried steaks and HUGE helpings of sides. It's definitely a down-home type place and one of my favorites.
Too bad I live in Houston now or I'd be willing to meet up for a drink with you. You'd be welcome to stop by the barn where my Road Runner is and finish up the Wilwood rear brakes for me!