The Boks had two children: a son, John Fairfield, in 1930 and a daughter, Joyce Annetta (now Mrs John Ambruster), in 1933. Priscilla stayed at home until the children finished high school, so she published less research herself in this period. Nevertheless, she was consistently involved with supporting Bart's research and their public outreach activities often put them together and gave her some degree of recognition. When Bart became a naturalized US citizen in 1938, he shortened his first name to "Bart".