John Jacob Astor
Gracie's great-grandson, Archibald Gracie IV (1858–1912), was a military officer and writer who survived the sinking of the RMS "Titanic" in 1912. Coincidentally, one of Gracie IV's fellow travellers on the "Titanic" was John Jacob Astor IV, great-grandson of frequent Gracie Mansion visitor, and personal friend of Gracie I, John Jacob Astor.