Hi Mike,
It sounds like you have some fascinating family history to explore, and your appointment at the National Library of Ireland should be a great opportunity to learn more about Andrew and Sarah.
As Andrew was born in 1846, you’ll generally need to look for church and parish records, such as baptismal records, rather than birth certificates. Some older records have unfortunately been lost, but surviving records are organised through genealogy centres around Ireland. Given the uncertainty between
Donegal and
Tyrone, checking the resources for both counties would be a good strategy.
As Andrew and Sarah married in 1879, their marriage falls within Ireland’s civil registration period, which began in 1864. These records are held by the
General Register Office of Ireland (GRO) and can include valuable information for your research.
Good luck with your research, and I hope you have a wonderful trip to Ireland in September.
Regards,
Eoin