Did you look at the 1901 Census for Ireland. The Laffan family is listed there (www.census.nationalarchives.ie
), all given as born in Dublin City. The baptisms of a lot of the children are recorded on www.irishgenealogy.ie
. There is also a baptism of a Danl Thos Laffan in July 1838, could that be your Daniel Laffan?