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I found an 1838 marriage record in Barryroe RC parish which is next to Clonakilty and the same parish where you located the 1846 baptismal record for Dennis. There is also a baptismal record for a Timothy Hurley on either May 19th 1844 or June 19th 1844 (two records are listed).
I would look in Clonakilty records on www.irishgenealogy.ie for John Hurley but records do not start until 1809. Also, look in Lislee/Ballyroe for Ellen Crowley. (I see at least three records).
Area - CORK & ROSS (RC) , Parish/Church/Congregation - LISLEE, ABBEYMAHON & DONOUGHMORE (BARRYROE)
Marriage of JOHANNEM HURLY of N/R and ELLENAM CROWLEY of N/R on 13 February 1838
HusbandWifeNameJOHANNEM HURLYELLENAM CROWLEY
Witness 1TIMOTHUS DONOVANWitness 3DIONGAEO CROWLY