Hi Lesa . . .
Welcome to Ireland Reaching Out . . .
I began searching . . . a fairly reliable search engine .. Roots (paid) . . for any traces of your extended family query . .
Given the Surname Small . . Wm. . . m. to Winnie Minogue . . plus all the children and their D.O.B. . .
I failed to find any thing or anyone . . matching your input . . . in Ireland ( Roots ...Ireland only )
So next I turned to Ancestry . . . and input the same info.
Here I got some info. which . . may or not . . add to your sum of knowledge . ..
Name:William Small Estimated Birth Year:abt 1802 Date of Registration:1868 Death Age:66 Registration District:Thurles Volume:3Page:519FHL Film Number:101584
This Wm.Small . . . is the Death notice . . . recorded for THURLES. Co.Tipperary . . . which geographically is close enough to CASHEL. Co.Tipp
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next . . . Death notice of a Wm.Small . . .
ViewName:William Small Event Type:Death Death Date:22 Mar 1868 Death Place:Castlegar, Galway, IrelandParish Variants:CarrabrownDiocese:Galway
which fits neatly with your info. ALSO ...
Ancestry . . records the Marriage to John OBrien . . .in Victoria. Aus. ..in 1856 . . . ( no record of any Birth details )
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Mary . . b.1826 . . . No clues on Ancestry . . .
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Margaret . . b. 1829
Aust. birth of a WILLIAM Seymour . . and a KATE. . . no date . . no location . . .
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John . . b.1830
Ancestry records . . .
Name:Jno Small Birth Year:abt 1830 Age:80Death Place:Northcote, Victoria Father's Name:Small Wm Mother's Name:Winifred Minogue Registration Year:1910 Registration Place:VictoriaRegistration Number:6621
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First REAL Clue . . . is an Ancestry Marriage note ....as follows . . .
Name:John Small Gender:Male Event Type:Marriage Marriage Date:Aug 1853 Marriage Place:Portroe, Ireland, IrelandParish Variants:Castletown Arrha, CastletownarraDiocese :Killaloe Spouse: Catherine Quin
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Honora . . b.1831 . . .
Ancestry throws up a Marriage . . . as follows . . . ( a maybe )
Name:Honora Quinn Gender:Female Marital status:Single Marriage Date:13 Dec 1858 Marriage Place:St Patricks, Wat, Ireland Father:William QuinnSpouse: James Hannaway FHL Film Number:101401Reference ID:549
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So Lesa . . . .
No great surprises . . . to my searching . . . just confirming your giving info. . .
Portroe . . is in County Tipperary . . . as is Cashel . . .
Best I could do . . . further searching is available . . ( at cost ) . . .https://www.tipperarycoco.ie/heritage/nenagh-heritage-centre
Best of Luck . . . with your continued searching . . .
Cheers . . . Eamonn.