Don't be conflicted. You would largely be starting out on blue terrain. Wrangler would be the only run, and even then, a narrow run with some pitch is not beginner terrain. Those lower runs tend to get chewed up, too.
I looked at Wolf Creek, but I don't like the lodging options. It's also a harder route for me driving from OKC. It's pretty much all interstate to Dillon.
So my first thought for you is Winter Park. Yes, you will have to go over Berthoud Pass, but no big deal in non-storm weather.
A few reasons why:
1) there is beginner appropriate terrain below mid-mountain and at the top off of High Lonesome if open. So you can truly get the big mountain experience as a beginner, and if you are hoping to stoke your family for more, that's a major card to play. WP has one of the best mid-mountain lodges, and it is beginner accessible (assuming we aren't snow skunked of course);
2) cost. WP has lots of good all-in packages. You may be able to stay on resort for the same total cost as staying in Dillon and skiing Breck, Keystone, or Copper;
3) logistics. Not having to drive and manage parking each day is huge for never-evers. Gear up, walk out, hit ski school. Or, get up way earlier, load gear in the car, find parking, unload gear, find bus, ride, walk to ski school. Some folk are fine with this, but if I am planning, making memories out of a logistics cluster is a cautionary tale.
Hope that helps. I think WP gives you the best shot at the big mountain experience that early in the season, even as true beginners.