Hi, and Welcome to the Great American RoadTrip Forum.

It is hard to comment on the early part of your trip, as I am not familiar with 7 feathers. Nor will google find it for me. That said, 500 miles on interstates will get you to your destination well before 8pm, unless you spend a lot of time sightseeing along the way. It would be about nine hours driving. The day from SF to LV is going to be a long one, and it may pay you to get away early, if you can. Not easy with your party. And as you will be aware, with little ones, and grandparents, every stops takes just that little bit longer.

If you are considering driving 101 on the way home, and I would not discourage you, it is a very worthwhile route, you will need to add a couple of extra days. It is much slower going, especially the Oregon coast. And you will want to stop in the Redwoods, at the Avenue of Giants. If you have not been there, you won't want to miss that.

Lifey