Without information but the names you will have to do your own searching.www.rootsireland.ie
has parish records for Fermanagh (usually these records end about 1900)
a marriage record would have only their father's names, place/parish, date
If you know marriage is after 1864 then you should be able to find a civil marriage records and births of their children.www.familysearch.org
civil records 1864-1950.
Tithe Applotments 1823-1837 now a census substitute www.genealogy.nationalarchives.ie
Griffith Valuation 1862 in Fermanagh, now a census substitute www.askaboutireland.ie
1901/1911 Census www.census.nationalarchives.ie
The 1911 census will tell you how long they were married at that time and how many children they had and how many are living at that time.
Electoral Registers for Ireland 1832-1838 List of Freeholders
1832 Hugh Elliott, Fermanagh
Only those who owned land were allowed to vote and at this time would probably be someone of means.
Philmore & Thrift Irish Wills. has a Hugh Elliot but dated 1764, Irish Wills Index.
Look for the Registry of Deeds Index Project - Ireland, if owned land
1 Passenger record - Unlikely as single:
Hugh Elliot sailed 12 June 1891 Londonderry to New York, a labourer, 40, single