The marriage of Patrick & Anna is on www.rootsireland.ie/:
Date of Marriage:05-Feb-1873
Parish / District:GARRISTOWN
Husband Patrick Walsh Address:Pluckhimin
Wife:AnnaBlake Address: Garristown
Husband's Father James
Wife's Father Christopher
Husband's Mother Anna
Wife's Mother Maria
Witness 1Thomas Brien
REV JAMES SHERIDAN
Annoyingly there are no Walsh or Blake records in Dublin in the 1851 census! I also tried 1901 but no joy.
I couldn't find any birth/baptism records on roots for either Patrick or Anna with the above-named parents in any year or county; no siblings either.
Possible marriage for Pat's parents:
Date of Marriage:16-Jun-1836
Parish / District:ST.PAUL'S ARRAN QUAY