I agree with the other posters. You would need years to see all the wonderful sights in the SW. Pick a general area and see the sights there. For example, Yellowstone and Tetons. Zion, Bryce and Moab. Glacier. Etc.
This is also what I would suggest. Two weeks roundtrip from Indiana, this is the only thing that makes sense to me. When we lived in the Chicago area, we'd take 2 1/2 weeks - counting the weekends on either side of the 2-week period too - for a camping vacation to Yellowstone and Salt Lake City, and it was barely enough. Many of the western national parks take more than one day to see, not to mention to really enjoy to the fullest, and with your timeframe, going to many different ones means you'll basically peek in the door and leave, figuratively speaking. Your family will enjoy the trip more if you're not on the road 12-15 hours a day too - and trust me, so will the driver(s)!