WILLIAM O'NEILL DUBLIN

If this William lived to adulthood and stayed in Ireland then the civil BMD records on IrishGenealogy would be the place to start - marriages are often best as they give more details which you can use to compare with the known details. e.g. father's name and occupation, residence of the groom, and sometimes names of witnesses.

Do you have occupation details for the father and any other addresses for the family, and details on the other two sons, did they both stay and marry in Ireland - was William a witness at either of their marriages, were any of these brothers still in Ireland for the 1901 or 1911 census returns  ?

Most of the Church Catholic and Church of Ireland records for the City area are also on IrishGenealogy website and have been transcribed - so a little easier to search for marriages than the civil records - I checked these and did not see a good match for a marriage of your William.

The difficulty with tracing forward from a baptism at this time without additional clues is that there are some possible complications that are difficult to follow up on - William could have died before the start of civil registration in 1864, he could have moved outside Dublin city or emigrated...
 

Just a quick note - there's a probable match for a burial of your Joseph O'Neill in Glasnevin Cemetery (Prospect) in 1902, reported age 52 and the address includes the words 'city' and 'quay' so fits with that death registration at Sir Patrick Dunn's Hospital. If it's a family plot there may be details of others in the same grave ... might be worth following up...

The Glasnevin Cemetery records are pay-per-view at dctrust.ie (Dublin Cemeteries Trust) - there's an extended option to show all those in a grave. Sometimes grave were shared so there could be others .. but if the family owned the plot all the burials in it could be family members

Based on your information I've seen the death records for Joseph, which includes his home address - they dont always do this ... so lucky break there, also the census for him and his family in 1901 and the couple marriage. Do you have 1901 census details for Mark & Francis  ?

Death records are the most difficult source to match up, or rule out, the only real clues, besides name and age (which is often inaccurate), can be occupation, address and informant ..

A quick search of deaths of a William O'Neill (and variants) from the start of civil records in 1864 up to 1905, with a year of birth around 1860 in Dublin city and county shows about 20 matches - register images for those from 1870 are on the IrishGenealogy website.  If  'your' William died before the start of civil records there would be no death record but there could be burial record if his grave was in Glasnevin (which opened in 1832).

I did a quick search of the burials and found a William O'Neill burial in 1885 with 'city' mentioned in his address, a cross check for deaths located a matching civil death record - William O'Neill died 17th June 1884 at Sir Patrick Dunn's Hospital  (see entry 426 in the register image) noted as from 22 City Quay, reported age 22 occupation a labourer, single - the informant is a W. Hiddle, for the Hospital.. looks like a pretty good match - same street, age is very  close, even the same place of death as Joseph...

correction - reported age 25 not 22, so estimated year of birth 1859

The burial record may give details of who paid for William's burial, which could help confirm him as part of your O'Neills - he could even be in the same plot as Joseph...
 

 

As I mentioned above, death records are not very informative - just date and place of death, name age and occupation of deceased, case of death and the informant - the informant can be a useful clue if it's a family member, but in William's case (and Joseph's) it's someone from the Hospital. The only case when a parent might be mentioned is on the death of a child if a parent was the informant - i.e. present at death. The other items that can be clues are the address, as in William's case, and sometimes the occupation if it's something distinctive.

You can view the full register entry for William's death in my post above...a research or official cert would contain the same details.

I'll follow up on those details for Mark & Frances..

Searching for the marriage depends on where, when and what type of marriage ... since it seems to have been a mixed marriage it's likely to have taken place in either a registry office or a Church of Ireland, a non-Catholic could not usually be married in a Catholic ceremony. Civil registration of non-Catholic and Registry Office marriages started in 1845, and full civil registration started in 1864.

The earliest child for your Thomas and Sarah seems to be 1860, so possibly there could be a civil record of the marriage - in which case the IrishGenealogy website is the place to search. Church of Ireland records would be included in the civil records from 1845 onward, for earlier records for the the city the Church records on IrishGenealogy is the best source, other area are a little more difficult - depends on the parish and county etc. Both FindMyPast and Ancestry have an index to civil records, which can be a little easier to search - once you have a possible match then switch to IrishGenealogy

I had a quick look for possible marriage in civil records - nothing promising that I could see... keep in mind that there could be variation is spelling for both first and surname - e.g. Weeks/Weaks/Neill/O'Neill/Neale etc and Sarah/Sara possibly even Sally/Sadie

There could have been earlier children outside Dublin city..which could move the timeline for th marriage back a bit further

Have you seen the other children - Anna born 1863 and Thomas born 1865 ?
The birth for Thomas is included in civil records - gives father's occupation as Coal Porter, the family were living at Carlisle Cottages at the time.