Lisa,
I probably can?t add much more than sympathy. I have dealt with many previous queries similar to yours, relating the 1700s or early 1800s. They are notoriously difficult to deal with.
You are correct that a lot of records were lost, notably early Church of Ireland records, the censuses, most wills, and a lot of other legal documents. However the Presbyterian church didn?t keep its records in Dublin. Yet they have huge gaps in them too. For other reasons.
The problem you face is that, in Ireland in the 1700s and 1800s, most people lived out their lives leaving little or no paper record. Most were illiterate, most transactions were oral, and they had little need of paper documentation. Their encounters with officialdom were mostly few and far between, and rarely led to a permanent record that has survived to the modern age.
There?s a note in the Drumgooland Church of Ireland records in the Public Record Office in Belfast, which says: ?The entries of baptisms from this date 2nd Jun 1833 were made from papers collected by me J. A. Bears, lying about the church and vestry room and put in this book after I received it from ? Thos I. Tighe at Parsons Hill on my becoming curate of the parish 1837.? Drumgooland church had existed since the early 1600s but no-one had evidently kept any records for 230 years. That probably tells you all you need to know about the standards of record keeping that sometimes prevailed in the 18th & 19th centuries. I came across a similar story relating to the Presbyterian church in Bellaghy, Co Londonderry where a new Minister arrived in 1838 to replace the previous one, Rev Charles Kennedy, who had been there since 1801. The incoming Minister asked the outgoing one for any records and papers he had to pass on. After a pause he said he had none. So no records for a 40 year period. An entire career and not a single written record! So all these factors lead to a situation today where often few or no surviving records exist at all for many people who emigrated from Ireland in the 1700s and early 1800s.
What is bizarre is that when these same people arrived in the USA they kept perfect records. Not sure what happened on the voyage over to make them change.
The pool of surnames here is much narrower than in the USA. We only had native Irish plus Scots, English and Welsh settlers. We haven?t had waves of migrants from all over the world (well not until recently anyway). I met a lady here last year from Ohio who was interested in the surname Linton (Presbyterian Scots origins like your Fergusons). She told me that there were 4 Lintons in the whole of Ohio and she was related to all of them. So she got very interested when she saw a Linton grave here. I had to show her the local phone book which has several pages of Lintons just for Co Antrim, to get the message across that whilst she might be related to all 4 in Ohio, she probably isn?t related to all the ones in Ireland. And they are not all descended from a single patriarch, as some seem to think. Dozens of them came from different parts of Scotland, and consequently there are dozens of families here. I had a quick look for Ferguson in the Comber area today and there?s 24 listed in the phone book (and 75% of the population here are ex-directory). And that?s a fairly small town. So a very common name, so will need to be careful when searching for records to make sure you get the right one.
You ask whether a father was likely to make his son executor if he was in America. I would have said no to that, unless the father was under the impression that his son might be intending to return. I have been surprised at the degree to which people did look after their business interests on the other side of the Atlantic during the late 1700s and 1800s but usually there was a power of attorney or a reliable 3rd party in place to carry out the absent person?s instructions. But to be an effective executor you do need to be in the place where the deceased held their assets. The Probate files in PRONI do have lots of files where executors have declined to act due to being overseas or otherwise unable to carry out their duties effectively. That?s why people often name 2 executors in their wills. If neither is available then the next of kin applies to the Probate court for a replacement to be appointed.
Do you have John Ferguson?s occupation from documents in the US? You were enquiring about another Ferguson who was a farmer. He?s not going to be an inn-keeper as well. They are going to be different Fergusons. Perhaps his occupation from marriage or death certs (if there are any) might help narrow your search.
The usual advice I give is to exhaust all US sources for clues as to a person denomination and townland, but you have obviously done all that already. Not sure I can add much more. Good luck anyway.
Elwyn