William J. Koch II (Bill) was born in New Jersey to parents William J. Koch and Sabella Farthing, who were both born in Germany and immigrated to New Jersey sometime in the 1880s or 1890s. Johanna Van Dyke was born in New Jersey to a Dutch family. Johanna’s father Orie Van Dyke and maternal grandparents Johannes Kornet and Hendrikje van der Heide immigrated from Holland in the 1880s. Bill and Johanna married in 1923 and settled in Midland Park, New Jersey. Together they had two children: Lois and William J. Koch III (Billy). In their later years, Bill and Johanna moved in with their daughter Lois and her family in Ithaca, NY.
Reinhart Yennie and Ella Clark were both born in New Jersey. Reinhard's parents Jacob Yennie and Rosina Schaffner Fritz both immigrated from Switzerland in 1865 and 1885, respectively. Ella's family has been in America for a long time, and different branches of her family include some of the earliest Dutch and English settlers of New York. Reinhart and Ella met, married, and stayed in New Jersey. Together they had two children: Kenneth (Ken) and Donald (Don). During World War II, Ken was in the Army's infantry division and Don was in the Navy, but Don's service was suspended until after the war because he was studying physics and engineering in college.
After Reinhart and Ella's son Don completed his naval service, including two years at Annapolis, he returned to graduate school at Columbia University. After graduating from high school, Bill and Johanna's daughter Lois worked as a secretary. Don and Lois had known each other as children, and met again after the war. They married in Midland Park, New Jersey in 1950 and soon relocated to Princeton for Don's post-doc at the university there. Following his career, they later moved to Stanford, CA, Minneapolis, MN, and Ithaca, NY. Together they had two children: Denise and Scott.