there's a good match for the birth of one of the sons - correct middle name, timeframe and district :
Name: Andrew Christopher Delany
Registration district: Dublin North
Event type: Birth
Quarter and year: Oct-Dec 1903
Volume: 2 / Page: 528
not seeing anything promising for the marriage at the moment, but Norah's maiden name from the birth cert should help narrow that down..
depending on which census you believe, it looks like Andrew snr. could have been born before the start of civil records - so you may need to check for parish records for him.
Shane