After years of trying to 'stay awake' when returning - usually dropping by 5pm,we decided to try a different tactic. Last year, we tried going to bed as soon as we got back, and setting the alarm, so we only have about 2/3 hours. Its a real struggle to get up, but it worked really well. Just having that small nap, was enough to keep us going til 9/10 pm and it was the first time in 40 years (of travelling back from US), that I felt fine the day after landing. We didn't get the usual horrible feeling in the pit of your stomach, and weren't walking round like zombies.
We will certainly try this again!
As regards to kids - I wouldn't like to force them back to school next day. Mine are usually out of sinc for days. As you know, its not as easy to get kids up when they are 'dog' tired.
Hope you have a great trip.
Tracy