if the above census returns are the right ones... then I have a possible marriage for Joseph and Catherine.
Name: Joseph Finn
Registration District: Dublin South
Event Type: Marriage
Quarter and Year: Apr - Jun 1894
volume : 2 / page : 615
Name: Kate Gleeson
[same index details]
Their first two children were born in Dublin city so that seems to fit as a location for the marriage.
there are a few possible births for Joseph on the
BMD Index - this one seems to be the best fit :
(note - see poss. marriage details later which seem to rule this particular birth out) Name: Joseph Finn
Registration District: Donaghmore (Co. Laois)
Event Type: Birth
Year: 1874
volume : 3 / page : 521
Details from the marriage cert could be used to confirm this (or rule it out ).
Shane