Don't know if you have this yet but IGI lists 3 children (mother listed as Mary Ann):
1. Margaret Ann Hanna born 28 Jan.1866 Fivemiletown district, Co. Tyrone
2. William James Hanna born 31 Oct.1868 Co. Tyrone
3. Aaron born Ireland m.1881 Rhode Island, U.s. (extracted marriage record- see IGI entry for full details).