He was born in Sioux Falls, Dakota (now South Dakota), and was a son of Fannie (Kingsbury) Grigsby and Melvin Grigsby, a prominent South Dakota political and military leader.
The individual was born in Sioux Falls, Dakota (now South Dakota), to Fannie (Kingsbury) Grigsby and Melvin Grigsby, a notable South Dakota leader in politics and the military.