Hello canada twig,
What denomination were your Hess and Seabrook ancestors? Were they members of the Catholic faith, the Established Church (Anglicans or Church of Ireland) or possibly Presbyterians?
You'll have to rely on Church records as civil registration in Ireland was not introduced until 1864. Non Catholic marriages were registered from 1845 onwards. When registration for BDMS started in 1864 some people didn't bother with the registration for a few years after that date. Keep your fingers crossed that church records still exist.
The
Eighteenth Century Sources. may assist you to find your Copeland and Henderson ancestors. Some of them are on John Hayes failteromhat.com website
Books of Survey and Distributions c. 1700
Catholic Qualification Rolls 1778 - 1793
Convert Rolls 1704-1839
Electors Rolls 1761
Estate Records and Marriage Licence Bonds
Flax Growers List 1796
Freeholders entitled to vote 1770
Grand Jurors and Books of Presentiments
Militia Lists 1761
Oath of Allegiance 1775
Poll Books 1752
Proprietors of land circa 1700 list
Protestant Householders 1740 list.
Register of Freeholders 1758
Return of Householders 1766
State prisoners 1798
Voters Lists 1727-1793
Christopher