Willis married Cynthia O. Hastings on 2 Nov 1857. Cynthia (daughter of Joseph Hastings and Cynthia Hutchins) was born on 2 Sep 1837 in Constable, Franklin, New York, USA. [Group Sheet] [Family Chart]

1. Frank E. Bullock was born on 5 Sep 1858 in Norfolk, , New York, USA.
2. Willis Bullock was born on 8 Oct 1861 in Constable, Franklin, New York, USA.
3. Aron S. Bullock was born on 6 Apr 1864 in Mount Vernon, , Iowa, USA.
4. Eugene H. Bullock was born on 26 Sep 1867 in Doniphan, Doniphan, Kansas, USA.
5. Joseph J. Bullock was born on 13 Apr 1872 in Doniphan, Doniphan, Kansas, USA.
6. Bertha A. Bullock was born on 8 Apr 1875 in likely Doniphan, Doniphan, Kansas, USA ; died on 8 Apr 1876.
7. Ella M. Bullock was born on 23 Dec 1877 in Doniphan, Doniphan, Kansas, USA.