John married Mary Edna McAuliffe 27 Nov 1902, Marshfield, , Massachusetts, United States. Mary (daughter of John Lawrence McAuliffe and Susan Harriett Strang) was born 23 Apr 1884, Pembroke, , Massachusetts, United States; died 31 Dec 1938, Boston, Suffolk, Massachusetts, United States. [Group Sheet]

1. Elizabeth Bradley Clark was born 5 May 1904; died 4 Sep 1904.
2. Clara Hayden Clark was born 15 Jun 1906.
3. Irene Frances Clark was born 9 Apr 1909; died 3 Sep 1970.
4. Elizabeth Adeline Clark was born 13 Nov 1910, Burrage, , Massachusetts, United States.
5. Elwin Howard Clark was born 27 Oct 1911, Duxbury, , Massachusetts, United States.
6. Elsie Harriett Clark was born 10 Jun 1915, Duxbury, , Massachusetts, United States; died 5 Apr 1999, Plymouth, , Massachusetts, United States; was buried 10 Apr 1999, Mayflower Cemetery, Duxbury, Massachusetts, United States.