My great-great-grandmother's parents were Margaret Dunseith/Dunseath and James Spiers/Spears. Margaret died 5 May 1854 in Ballymoney. Co. Antrim, Northern Ireland. Her husband had died before 1852. It appears that the couple had at least 7 children with marriages connecting them to the Harkley, Montgomery, Simpson, & Martin families.
Some of the children left Ireland before/after 1850 and settled in Pennsylvania although there were also ties to Canada.
I believe that Margaret had a brother, Allen Dunseith/Dunseath.
I would be interested in finding out more about both of these families and/or communicating with others researching them.