The NFL pro shares son Jack with ex Bridget Moynahan and son Benjamin and daughter Vivian with ex Gisele Bündchen Carmen Mandato/Getty Images ... of his kids as they sat on their dirt bikes ...

The Voltaic Kids Electric Dirt Bike is designed for kids three to five years old under 75 pounds. Credit: Voltaic Deal pricing and availability subject to change after time of publication.

And the kids cut loose on a played-out gravel pit turned obstacle course, an hour north of Detroit. Some sprayed dirt from screaming dirt bikes. Others jounced on all-terrain vehicles, better ...