Don't know where to start

[heywood]

I think I’m with you, Gaffy. It seems a bit complex, doesn’t it.
Here is the parish record of the marriage of Catherine Mallaghan and James Owens. They have been recorded as James Jones and Catherine Mallon but all the other details are correct.
27th January 1874

https://registers.nli.ie/registers/vtls000633206?locale=en#page/43/mode/1up

This Catherine has a mother Frances. The witness, John Mallaghan has the address Marquis Street.
This does not answer the puzzle about Susan Mallaghan.
Perhaps the two Catherines were cousins and their two fathers brothers.

[heywood]

Not sure if I am posting anything new, but here is the death of John Mallaghan in 1875.
He is 31 yrs, an auctioneer of 5  Chapel Lane (see first post) and the informant is Margaret McKeown of 24 Marquis Street.
https://www.irishgenealogy.ie/files/civil/deaths_returns/deaths_1875/020607/7230560.pdf

Margaret McKeown was a witness to both Catherines’ marriages.

[gaffy]

Gaffy, check out the marriage record for Catherine in the opening post.

Sorry, I don't get it. Who is Thomas, how does he fit in to this?

Thomas is my Great Great grandfather, husband of Catherine.

No, not Thomas Maguire, Thomas Mallaghan as in my previous reply #50:

- who died in 1886 at the same address where Susan Mallaghan died in 1888; and
- whose daughter married someone (James Owens) in 1874 living at the same address where Patrick Mallaghan died in 1874.

[Neale1961]

I think Patrick Mallaghan and Thomas Mallaghan were probably brothers. Needs further research to confirm.

This is the death of Patrick, father of Catherine who married Thomas Maguire (from reply #30)

Possible death for Patrick Mallaghan in 1874
Occupation – dealer
Daughter Catherine is informant
https://www.irishgenealogy.ie/files/civil/deaths_returns/deaths_1874/020673/7253940.pdf

[gaffy]

I think I’m with you, Gaffy. It seems a bit complex, doesn’t it.
Here is the parish record of the marriage of Catherine Mallaghan and James Owens. They have been recorded as James Jones and Catherine Mallon but all the other details are correct.
27th January 1874

https://registers.nli.ie/registers/vtls000633206?locale=en#page/43/mode/1up

This Catherine has a mother Frances. The witness, John Mallaghan has the address Marquis Street.
This does not answer the puzzle about Susan Mallaghan.
Perhaps the two Catherines were cousins and their two fathers brothers.

Great find, I would never thought of looking under Mallon. It must be something like that, if not brothers, maybe cousins. 

OP, the ages and dates indicate that we may already be too far back to find any useful records, this may prove to be a brick wall. I can't see any marriage for Patrick and Susan, nor baptisms for daughters Catherine and Mary.  A couple of observations: (1) I noticed other Belfast Mal(l)aghans/Malligans on the go who were all sons of Henry (Edward, Thomas, Peter, Patrick) and who were all dealers or auctioneers or brokers, I wouldn't be surprised if related back in time; (2) a quick check of older ones with this surname in the 1901 Ireland Census shows a cluster in the Ballymena area and others pointing back to counties Tyrone and Londonderry, so Patrick and ancestors might have been blow ins to Belfast.

[gaffy]

Not sure if I am posting anything new, but here is the death of John Mallaghan in 1875.
He is 31 yrs, an auctioneer of 5  Chapel Lane (see first post) and the informant is Margaret McKeown of 24 Marquis Street.
https://www.irishgenealogy.ie/files/civil/deaths_returns/deaths_1875/020607/7230560.pdf

Margaret McKeown was a witness to both Catherines’ marriages.

Another good find, clearly related.

[mrjmitchell]

I think I’m with you, Gaffy. It seems a bit complex, doesn’t it.
Here is the parish record of the marriage of Catherine Mallaghan and James Owens. They have been recorded as James Jones and Catherine Mallon but all the other details are correct.
27th January 1874

https://registers.nli.ie/registers/vtls000633206?locale=en#page/43/mode/1up

This Catherine has a mother Frances. The witness, John Mallaghan has the address Marquis Street.
This does not answer the puzzle about Susan Mallaghan.
Perhaps the two Catherines were cousins and their two fathers brothers.

Great find, I would never thought of looking under Mallon. It must be something like that, if not brothers, maybe cousins. 

OP, the ages and dates indicate that we may already be too far back to find any useful records, this may prove to be a brick wall. I can't see any marriage for Patrick and Susan, nor baptisms for daughters Catherine and Mary.  A couple of observations: (1) I noticed other Belfast Mal(l)aghans/Malligans on the go who were all sons of Henry (Edward, Thomas, Peter, Patrick) and who were all dealers or auctioneers or brokers, I wouldn't be surprised if related back in time; (2) a quick check of older ones with this surname in the 1901 Ireland Census shows a cluster in the Ballymena area and others pointing back to counties Tyrone and Londonderry, so Patrick and ancestors might have been blow ins to Belfast.

Thanks so much for all your help. Much appreciated.

[gaffy]

I can see a transcription of a baptism at St. Mary's Belfast on 20 May 1883 for a Mary Jane "Marran" for parents Robert "Marran" and Mary "Monaghan" of 5 Chapel Lane (there's that address again), the sponsor was Mary McCormick, I wonder if this is a mistranscription of Robert Morrow and Mary Malaghan?  Unfortunately, not available to view on the NLI RC parish records website. Can't see a civil registration either. I was hoping to track Robert and Mary forward, for example, to see them in the 1901 Ireland Census (Mary's birth place would be nice to see).

Anyhow, here are some listings for Chapel Lane in the Belfast Street Directory:

1880: 5 Malaghan, Mrs., green grocer
1884: 5 Monaghan, Susan

[Neale1961]

Henry Mallaghan died 1890 (age 80) Auctioneer, Lodge Road (informant son Peter)
https://www.irishgenealogy.ie/files/civil/deaths_returns/deaths_1890/06119/4746956.pdf

Henry was in Belfast working as an auctioneer from at least 1850 when he was in Hercules Street

Henry was married to Mary (nee Campbell) who died 12 Nov 1889.
Sons Peter - civil birth registration 1865
Other sons mentioned in his Will – Cornelius (1860-1892) and Patrick (born abt 1862; married Elizabeth Fisher in 1899).

Working on ages (approx. births), I think this Henry Mallaghan may have been brother to your Patrick Mallaghan (1814-1874) and to Thomas Mallaghan (1822-1886) – all auctioneer / dealers.