Oscar C. Boldt learned construction under the guidance of his grandfather, Martin, and his father, Oscar J. Boldt. After serving as a B-24 navigator in the Army Air Corps during World War II, he graduated with a degree in civil engineering from the University of Wisconsin—Madison. In 1950, he became the third generation of his family to assume leadership of the company. He was preceded in death by his parents Oscar J. and Dorothy (Bartmann); sister Lola Mae (J.O. Kopplin), and his dear and loving daughter Peggy Anderson. He is survived by his wife Patricia (Hamar); sons Charles (Linda) and Thomas (Renee), former daughter-in-law Linda Boldt, and son-in-law Brian Anderson; as well as grandchildren Andrew (Jen) Boldt, David (Ellen) Boldt, Seth (Brittany) Anderson, Maggie (Taylor) Forbush, Stiles (Nicole) Anderson, Phillip Boldt and Claire Boldt; as well as great-grandchildren Henry and Peter Boldt, Brody, Sadie, and Adele Anderson, and Liv Anderson.