At some point on your commute (maybe when you enter your neighborhood), just stop. Pull off to the side of the road. Turn off the car. Stop for five minutes.

At some point on your commute (maybe when you enter your neighborhood), just stop. Pull off to the side of the road. Turn off the car. Stop for five minutes. In your mind, swap out your work. I mean "swap out" in the OS sense - dump it to disk, free up working memory. Swap in your family. Then start the car and drive the rest of the way home.