We did a tent trip to FW last November. Our kids were 3 and 1. What really helped us was bringing a 'camp kitchen' table with a built-in sink, along with a separate dining tent. The table folds flat for storage, then you assemble the sink hardware on site:
http://www.kotulas.com/deals/portable-camp-fish-cleaning-table-with-faucet-small
With little ones, having running water easily available at the site was great. For cooking we picked up a cheap two-burner electric range-top for around $20. We did grill chicken once, with the on-site grill (bring foil for that).
We also brought a mini-fridge and air mattresses for everyone. Our son was in a pack-and-play at the time.
The main tent - make sure you get cheap tarps for under the tent, as a moisture barrier. If you don't, its likely the underside of your tent floor is going to be a mess when you tear down.
In general, load for bear! We packed a large SUV full to the gills, and wound up using nearly everything we brought. Make a master packing list.
We stayed in the 1500 loop last month (in a pop-up this time). Its a great loop and very close to the pool. We were in the 2000 loop when we tented, and I feel the sites are a little larger in 1500. Its a mile from the horse farm to Wilderness Lodge.