Hi;
I have a record of the marriage not the actual certificate unfortunately, I hope to get more information at the PRONI office. They are registered as married in the Termoneeny Church of Ireland, in the Termoneeny Parish, near Maghera, Co. Derry, barony of Loughinsholin in November of 1850. Their children were baptised in the Presbyterian church in Maghera.
I can locate my great great grandfather in the baptismal records, the 1880 census in Philadelphia, his marriage record here in Canada but the rest of the family?
Although the parish records for the Presbyterian church in Maghera state that Jane Shiels was excommunicated for joining the romish a year before she was married and also the names of Jane and James and their two daughters?

may be listed as being buried at the Lavey Roman Catholic Church under the name McElwee. I am not sure at this time as I need to see those records.