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Of the two sons of Dr. Chapman, the elder, John Biddle Chapman, was born in Philadelphia, June 3, 1811. He graduated from the University of Pennsylvania in 1829. He is said to have studied law, but there is no record of his admission to the local bar. He made his home in his native city, where he became an active figure, especially in the social development of his day. His promising career was terminated by his early death February 28, 1845, when not yet 34 years of age.

Mr. Chapman married, May 22, 1833, Mary Gabriela Randolph, daughter of Thomas Mann and Harriet (n‚e Wilson) Randolph, and adopted daughter of Dr. John Brockenbrough. Her father, Thomas Mann Randolph, was a half-brother of Thomas Mann Randolph--(for unique domestic reasons the brothers were given exactly the same name)--governor of Virginia, and son-in-law of President Thomas Jefferson. He was a son of the elder Thomas Mann Randolph, of "Tuckahoe," Goochland County, Va., who was the only son of William Randolph, of the same place, who was the eldest son of Thomas Randolph, also of the same place, who in turn was the second son of William Randolph, of "Turkey Island," Henrico County, founder of this distinguished Virginia family.

Mrs. Chapman, n‚e Randolph, died in Richmond, Va., July 1, 1837, only four years after her marriage