William G. Rohrer, Jr., was born in Williamsport, Pennsylvania, in 1909, the son of William G. and Avis Rohrer. He had four sisters: Frances, Dorothy, Florence, and Catherine. The elder William G. Rohrer owned a car dealership in Pottsville, Pennsylvania, in the 1920s, and moved the dealership to Camden, New Jersey, in 1929. William G. Rohrer, Jr., took over the business after his father's death in 1935. During the final year of World War II, he served with the United States Army at Fort Dix, New Jersey; Camp Lee, Virginia; New Cumberland, Pennsylvania; and Indiantown Gap, Pennsylvania. After the war, he returned to his home in Westmont, New Jersey, a district within Haddon Township. He later purchased and ran a successful bank, the First Peoples Bank, and became a well-known philanthropist. Rohrer married Floretta Tulk ("Florrie") in 1942, and they had at least two daughters, Linda and Eileen, before divorcing in 1969. He then married a woman named Mimi, who was later accused of murdering their adopted son, William G. Rohrer III. From 1951-1987, Rohrer was mayor of Haddon Township, New Jersey, the first to hold the post. William G. Rohrer, Jr., died in September 1989.
Frances Rohrer and her husband, a man named Withers, lived in Westmont, New Jersey, and had at least one daughter, Joan. Catherine Rohrer ("Kate" or "Kay") married E. L. Brill and lived in Philadelphia, Pennsylvania, in the mid-1940s.