Jacob married Elizabeth Cruzan on 19 Jan 1843 in Hamilton County, Indiana, United States. Elizabeth (daughter of Garret Cruzan and Sarah "Sally" Jacobs) was born on 25 Jan 1825 in Brown County, Ohio, United States; died on 12 Mar 1909 in Jefferson Township, Boone, Indiana, United States; was buried on 14 May 1909 in Cicero, Hamilton, Indiana, United States. [Group Sheet] [Family Chart]

1. Sarah Slack was born in 1843 in Indiana, United States; and died.
2. Albert Slack was born in 1845 in Indiana, United States; and died.
3. Richard E. Slack was born in 1847 in Indiana, United States; and died.
4. Mary Slack was born in 1850 in Indiana, United States; and died.
5. Clara D. Slack was born in 1865 in Indiana, United States; and died.