John married Louisa Zimmerman about 1893 in Brooklyn, Kings County, New York, USA, and was divorced. Louisa (daughter of Johannes Zimmermann and Anna Maria Braun) was born on 20 Mar 1876 in Brooklyn, Kings County, New York, USA; died on 12 May 1939 in Brooklyn, Kings County, New York, USA. [Group Sheet] [Family Chart]

1. Joseph Duffy was born in 1894 in New York, USA.
2. John Duffy was born in 1895 in New York, USA.
3. Julia Duffy was born in 1897 in New York, USA.
4. Michael Duffy was born in 1898 in New York, USA.
5. Vincent Duffy was born on 7 Mar 1902 in New York, USA; died in 0Jan 1971 in Brooklyn, Kings County, New York, USA.