Whispering Canyon no longer has a la carte choices at dinner. It is the all you care to eat platter, not the skillet. At lunch there is no longer a skillet option at all. It is a big change and I wanted you to understand the current choices.
I think your plan is Excellent. My #1 suggestion was going to be HDDR. Pure Disney and great fun for your ages. 'OHana is good food and fun atmosphere. We love 50's PTC and I think your aunt and uncle will get a hoot out of it. We haven't been to BOG yet - good luck getting an ADR. Of all your choices the only one I wouldn't recommend, and I am in the minority here on the DIS, is Yachtsmen. We will never return. We tried 3 times and just didn't enjoy our entrees. The restaurant is beautiful, the service was great and the onion rolls are to die for. But everything was just not good.
Have Fun