Daniel is christened at Rathfriland in Co Down on 14/11/1872
https://www.familysearch.org/ark:/61903/1:1:FPBV-G5T?lang=enThere is a marriage in 1866. I think Henry may have been born before 1851 if this is the correct marriage. Where does the year of 1851 come from please?
https://www.familysearch.org/ark:/61903/1:1:FGD7-FT3?lang=enThere is this note of a marriage as well
https://www.familysearch.org/ark:/61903/1:1:6V7S-RZPD?lang=enFrom this marriage certificate we can note that the father's name is Daniel Duggan. (NB this aligns also with Irish naming patterns)
Traditional Naming Pattern
A traditional naming pattern was often used by Irish parents until the later 19th century:
First son usually named for the father's father
Second son usually named for the mother's father
Third son usually named for the father
Fourth son usually named for the father's eldest brother
Fifth son usually named for the mother's eldest brother
First daughter usually named for the mother's mother
Second daughter usually named for the father's mother
Third daughter usually named for the mother
Fourth daughter usually named for the mother's eldest sister
Fifth daughter usually named for the father's eldest sister.
We need to get this information from you so we don't waste time chasing families that may not be correct.
ETA Can you let us know the age of Daniel in the census - this has been translated as a smiley face in your post
Actually the ages of the children and parents from this census would be useful