I'm not seeing any good birth matches for the two younger girls, and too many for Patrick, but there are just a few for Henry....assuming they lived in the same area at the time of his birth..
Name: Henry Smith
Registration district: Dublin South
Event type: Birth
Quarter and year: Oct-Dec 1893
Volume: 2 / Page: 535
Name: Henry Dare Smith
Registration district: Dublin South
Event type: Birth
Quarter and year: Apr - Jun 1891
Volume: 2 / Page: 623
Name: Henry Lewis Smyth
Registration district: Dublin South
Event type: Birth
Quarter and year: Oct-Dec 1892
Volume: 2 / Page: 505
Due to the middle name and spelling, the second two can probably be put to one side for the moment - but the first one might be worth trying to see if the mother's name is Julia...
see :
link (FamilySearch)
the BMD Index also includes a possible match for Julia's death :
see :
Julia Smith, Jul/Sept 1908Shane