John, we live in NY--where are you located?
You ask a couple of really good questions:
I am not entirely sure that I have constructed an accurate record for Timothy "Thady" Keogh: it seems possible that what I have is actually a composite of several individuals, and I don't have any tangible proof that I am on the right track. From the available evidence, it looks like my g-g-grandfather was born in Ireland as Thady Keogh around 1812, and that he was known as Timothy Keogh after moving to the US sat some point in the 1860s. I don't have any proof that he was the man involved in the newspaper clippings I sent you, either.
The clippings come from the following sources:
Dublin Evening Mail Jan 24, 1848
Leinster Express Nov 27, 1858
Westmeath Independent, Dec 4, 1858
Belfast Newsletter Feb 15, 1859
Belfast Newsletter Nov 11, 1859
If you send me your e-mail address, I will be happy to mail you copies of all of these clippings (there are a few omitted in my earlier posting).
There is a Thadeus KEOGH listed in the 1854 Griffith's Valuation of Cleraun, Cashel parish, Ballymahon Union, Longford, IRL.
I also found a reference to the Cashel Parish Records for a Marriage between Thadeus KEOGH, and, Brigid CONNIFFE, 26 February 1838 - Loughil, Cashel Parish, Co. Longford. I believe that this information was initially discovered by a member of the Byrne family, who have a tree on ancestry.com--Catherine Keogh Kilbride of this family is a grand-daughter of Thady Keogh and Bridget Conniff and the sister of my g-grandfather John Keogh.
My wife and I visited Ireland in April and I located the church where they had been married: it is quite near Lough Ree, which happens to be located on the line that divides the three counties of Longford, Roscommon and Westmeath. This was a little tricky--there are no named roads in what is now called Newtowncashel, and I didn't have enough of an address for the church to program my GPS. I made contact with a member of the church through the website, and the fellow was kind enough to provide written driving instructions from the motorway.
Baptisms Parish Records exist for the following children of Thadeus Keogh, and Brigid Conniff,:
William (12 May 1839) m. Margaret ?
Margaret (29 August ) m. ? Cassidy
Brigid (4 April 1844) m. James Kenney
Mary (18 December 1846)
Catharine (1849) m. James Kilbride
I believe that there was also a daughter Mary, who married a Thomas Nestor
I started this search for the parent of my G-grandfather John KEOGH b: May 1856, who I am speculating was the sixth child born to Thadeus and Brigid.
But it's a matter of making educated guesses: there was also a Thady Keogh married to Bridget Begly in Sixmile Bridge Parish, but the wedding date occurred after the birth of several of my G-grandfather's siblings. This couple also had a son, John Keogh, but he was born 5 years after my g-grandfather, and the names and dates of this couple's other children don't fit the US records I've seen.
Thady and Bridget Conniff Keogh came to Brooklyn NY with their children at some point before the late 1860s, although I haven't been able to locate any documents associated with this trip. Again, I believe that Thady called himself Timothy after arriving in NY: all of the information that I have refers to Bridget as the widow of Timothy Keogh. Interesting that the family all stayed in the area of Green Point, Brooklyn--a classic US immigrant destination--until after WW2.
The US records are more firm, and mesh well with the bits and pieces my father had told me over the years. However, I have not found any references to a Timothy/Thady Keogh in the US census that I think are connected to this family: I literally do not have any US records with his name on them other than a death certificate, which is a little shaky. I did find a Timothy and Brigid who lived in New Jersey to relatively advanced ages, but the children of the NJ couple do not match my G-grandfather and the sibs that I have been able to verify. I visited the cemetery in Brooklyn where the family now rests, but the grave record is unclear: a Timothy Keogh is interred, but he is listed as being a 7 year old child (son of Thady and Bridget's oldest child, William Keogh).
The first believeable match is an 1873 Brooklyn City Directory record for Bridget Keogh, widow of Timothy, who lived at 88 Navy. Bridget appears to be living at this address in 1876 together with her son William. In 1878 she was living at 17 Raymond St; Bridget Keough appears in the 1880 census as a resident at this address together with John Keough. Johns occupation is listed as Harness Maker, which was my G-grandfathers trade.
Incidentally, Katie Kilbride (together with her husband James and family) also lived at this address: Katie appears to be Timothy and Bridgets daughter Katherine.
Findagrave.com lists Bridget Kenniff Keogh (b. 1825, d. June 18, 1891) in Holy Cross Cemetery in Brooklyn. I am certain that this is my g-grandfathers mother as the same section of the cemetery also is shared by my g-grandfather John Keogh, his wife Catherine (1857-1938), and brother William (1849 1889). I also have a clipping from a Brooklyn newspaper of her obituary, which states that she was from Co. Longford.
Thanks to an ancestry buddy, Lisa, I do have a death certificate for "Thimothy Kehoe" - possibly Timothy Keogh? who died at 56 (?) years of age on 19th of April, 1868 in Brooklyn, New York. Thimothy was born in Ireland to Irish parents and having lived in Brooklyn for 3 years (suggesting that the family migrated to the US about 1865). This same record indicates that he was buried in "Flatbush" (Holy Cross cemetery).
There are a few problems I'd love to iron out:
William Keogh's baptismal record cited above is for 1839, but other records suggest that the brother William buried in Holy Cross cemetery was born in 1849.
Catharine Keogh was baptized in 1849, but Catherine Kilbrides records appear to have a 1851 birthdate.
Bridget Coniffe's birth date is hazy as well: Bridget Kenniff Keogh (b. 1825) seems too young to have married in 1838, and I found a reference somewhere suggesting an 1815 birth date for the bride in Ireland. If 1815 is accurate, she was rather old when John Keogh was born in 1856 (although stranger things have happened!).
That's all that I have to share at this point. I would be delighted if you have any information that would shed light on any of our (common?) ancestors.