and give birth to Gretsch's great-granddaughter, Mary Jacqueline Astor (b. 1949), who married John Rozet Drexel IV (b. 1945), great-great-grandson of Anthony Joseph Drexel, in 1984. Gretsch was also the grandfather of Marion G. Wells, daughter of Louis and Marion Downey Gretsch.

On April 11, 1895, Gretsch traveled aboard the SS ''Fürst Bismarck'' to Hamburg