The couple had three sons: Cassius Clay Herrick (July 17, 1867 – March 1935); Francis Warfield (February 9, 1869 – May 16, 1919); and Green (August 11, 1871 – 10 Jan 1962).

Her mother Mary Jane Warfield Clay was left homeless after she had managed White Hall, the family estate, for 45 years.

[4] In May 1879, Mary B. Clay went to St. Louis, Missouri to attend the tenth anniversary of the National Woman Suffrage Association.

While living in Ann Arbor, Michigan, to educate her two younger sons, she organized a suffrage club there.

She also edited a column in the Ann Arbor "Register and spoke before the senior law class of the University of Michigan on the "Constitutional Right of Women to Vote.

[6] Clay died on October 12, 1924, one day shy of her 85th birthday, and is interred at Lexington Cemetery.