He was the brother of Robert Samuel Maclay, a pioneer missionary to China; and the uncle of Robert Maclay Widney, a founder of the University of Southern California, and of Joseph Widney, the second president of the University of Southern California.
In 1874, the heirs of Eulogio de Celis sold their northern half of Rancho Ex-Mission San Fernando lands to northern Californians, California State Senator Charles Maclay and his partners George K. Porter, a San Francisco shoe manufacturer, and his brother Benjamin F. Porter.
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