Hi dizcaz,
There is a Public Member Tree on Ancestry 'Ryan-Sweeney Tree', which has John Duggan and Margaret Kilkenny listed.
They were married at St Patrick's Leeds which fits the Quarry Hill Area.
3 children are shown, two 'private' which means presumed still living, and one deceased - Mary Agnes (1896-1898).
The tree belongs to 'greenmillca' who is in Redding, California.
Hope this helps your search.
Ian