The accident occurred about 2:25 p.m. Saturday afternoon on the property of fourth-generation candy maker Herman Rowland Sr. during a family reunion, authorities said. Rowland is a collector of the military vehicles, which he stores in a restoration facility known as "The Tank Barn," the Daily Republic reported.
Rowland's daughter, Lisa Rowland Brasher, was named chief executive in March and reports to her father, who is now the company's chairman. It was her husband, Dwayne Brasher, 62, of Vacaville, who was driving the 1944 M5 tank, authorities said.
The California Highway Patrol said the victim was Kevin Wright, 54, of Suisun City, Calif.