In 1868, McPherson married Edla Jane Gregory (1845–1901). Their children included Gregory (1868–1896) and Edla (1873–1901), who was known as Ella. In 1898, Ella McPherson married Dr. Joseph Muir. When McPherson died, his wife inherited his estate, which was estimated at $500,000 (about $15.5 million in 2020). When Edla Gregory McPherson died in early 1901, news accounts revealed that she had disapproved of her daughter's marriage and changed her will to provide Ella McPherson Muir only an annual income from the estate during her life, with the bulk being donated to
Yale University, of which Gregory McPherson was an alumnus. Mrs. Muir contested the will, but died in late 1901 while the court case was still in progress. Dr. Muir continued to contest the will as his wife's heir. The estate was settled in late 1902 with payments to Dr. Muir, Yale University, and members of the extended McPherson family. With his second wife, Joseph Muir was the father of architect
Edla Muir, whom he named after his first wife. ==References==