There is an obituary for Robert Ehrenspeck on November 28, 1888, that says that he married Mary Stein of Yonkers in February, 1873, and that she died in 1878.
"Robert Ehrenspeck," The Yonkers Gazette (Yonkers, New York), November 24, 1888, p. 3.
https://www.newspapers.com/image/675844460/?terms=Ehrenspeck&match=1