Not sure how far your searching may have gone this week but the following may help
LINK to 1901 census showing James, Patrick and John POWER
at #10 Carnglass, (Kilcockin, Waterford) as mentioned
LINK to 1911 census showing Patrick POWER with Michael CALLAGHAN and family
at #1 in Carnglass (Kilcockan, Waterford) as mentioned
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I think that Jane/Janet POWER m Patrick CALLIHAN on Feb 13 1866
LINK to church records although the writing is difficult to distinguish and the groom's surname looks incorrect!
This ties in with the census returns and children's baptisms but would require further confirmation
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Michael CALLAGHAN b. Mar 26 1867 bap. Mar 28 1867; Sponsors: Patrick POWER and Honor DALEY
John CALLAGHAN b. Dec 07 1868 bap. Nov 24 1868!; Sponsors: John CALLAHAN and Ellen MULCAHY
James CALLAGHAN b. Apr 19 1872 bap. Apr 20 1872; Sponsors: Andrew CARTHY and Brigid POWER -
possibly a sister/SIL?LINK to church baptism record for John (noting written in Latin); Patrick and James before and after in same book
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Michael CALLAGHAN (f) Patrick of Camphire
married Oct 07 1900 in Cappoquin, Co. Waterford -
LINKKatherine BARRY (f) John of Camphire
Witnesses: Michael CULLINANE and Mary BARRY
Children:
LINKPatrick 1902
Brigid 1903
John 1906
Mary 1909
Margaret 1913
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Three deaths showing no age in 1917, 1918 and 1920 in the same civil district, Lismore, for a Patrick POWER -
LINKThree deaths showing no age in 1908, 1909 and 1911 in the same civil district, Lismore, for a James POWER -
LINKI don't see immediate births for the POWERS in the 1840s but unfortunately the records from that time are scarce