Cornelius Lyons was a son of Daniel Lyons and Catherine Byrne.
Ellen Hayes was a daughter of James Hayes and Margaritta Sullivan. These were the Sullivan Bouge clan.

Cornelius Lyons of Railway Cottages and Ellen Hayes of 2 Hanover Street married on 17 February 1878 in St. Finbarr's Church, South Parish, Cork.  The marriage witnesses were Eugene Sullivan and Margaret Duggan.
See typed version of record at bottom of this page.
Hereunder is the handwritten record entry on the Church register.

From the above entry we note that the addresses of the parents are included
   Daniel Lyons and Catherine Burns from Canaway (aka Canovee but officially Cannaway)
   James Hayes and Margaritta Sullivan from Kilbrittain

Children born on dates on Civil Birth Register:

Christopher Daniel Lyons, 25 Dec 1878 @ 7 Rocksboro Cottages.  (father was a letter carrier)

James Joseph Lyons, 15 Jan 1881 @ 8 Wycherly's Terrace.  (father was a letter carrier)

Mary Catherine Lyons, 26 Mar 1882 @ 8 Wycherley's Terrace.  (father was a letter carrier)

John Lyons, 20 Apr 1884 @ 30 Prosperity Square.  (father was a letter carrier)

Jeremiah Lyons, 10 May 1886 @ 1 Greenmount Terrace.  (father was a postman)

Margaret M Lyons, 17 Mar 1888 @ 1 St. Patrick's Terrace, Greenmount. (father was a postman)

Catherine Lyons, 16 Feb 1890 @ 1 St. Patrick's Terrace, Greenmount. (father was a postman).  Catherine married Thomas O'Halloran on 16 July 1921 in cork

Joseph Lyons, 19 Mar 1892 @ 1 St. Patrick's Terrace, Greenmount (father was Town Postman)

Lilly Lyons, 9 Mar 1894 @ 1 St. Patrick's Terrace, Greenmount. (father was a postman)

Census 1901:
http://www.census.nationalarchives.ie/pages/1901/Cork/Cork_Urban_No__5/Evergreen_Street__part_/1114527/

Census 1911:
http://www.census.nationalarchives.ie/pages/1911/Cork/Cork_No__5_Urban__part_of_/Evergreen_Street__part_of_/398504/

Deaths:
Ellen Lyons died at 60 Evergreen Street on 6 August 1907.  From her death record she was married, aged 52 years, wife of postman.  Present at her death and the Informant of it to the Civil Register was Cornelius Lyons, widower, 60 Evergreen Street, Cork.
Cornelius Lyons died on 6 February 1935 at 60 Evergreen Buildings.  From his death record he was a widower, aged 80 years, a P.O. Pensioner.  Present at his death and the Informant to the Civil Register was Thomas O'Halloran, 1 Evergreen Buildings, Cork.