Is this the couple?
Area - KERRY (RC) , Parish/Church/Congregation - ARDFERT
Marriage of JOHN KENNY of CHAPLETOWN and BRIDGET KING of BANNA on 15 February 1865
Husband Wife
Name JOHN KENNY BRIDGET KING
Address CHAPLETOWN BANNA
Father THOMAS KENNY JOHN KING
Further details in the record
Priest REV. JOHN O'CONNELL
Witness 1 TIMOTHY KEAN
Witness 2 DENIS MURPHY
Book Number Page Entry Number Record_Identifier
3 18 N/R KY-RC-MA-5169
If so, Ballynahaglish is in the Chapeltown area (there is another Chapeltown further away and not in the Ardfert area) and shows two sons:
http://www.census.nationalarchives.ie/pages/1901/Kerry/Ballynahaglish/Ballymakegoge/1430815/
I also see a Bridget Kenny deceased at age 45 in 1891. The census has the younger child born circa 1889.
With John showing age 66 in 1901, we can impute his birth circa 1835, I did not see a census for this John in 1911, but filtering for the surname and DED of Ballynahaglish, it shows Simon's family. The only death for record that come close i for a John Kenny between the two census records has an imputed birth year of 1851 but that would have to have been an error if indeed it were for the John Kenny who had married Bridget King.
There is this baptismal record for a John Kenny born about 15 miles away on the Dingle peninsula:
Area - KERRY (RC) , Parish/Church/Congregation - ANNASCAUL
Baptism of JOHN KENNEY of COOLES on 17 September 1837
Name JOHN KENNEY
Date of Birth 17 September 1837
Address COOLES
Father THOMAS KENNEY
Mother MARY DUGGAN
Child Denomination RC
Sponsor 1 BARTHOLOMEW LOUCEY
Sponsor 2 MARY CONNELL
Book Number Page Entry Number Record_Identifier
N/R N/R 60 KY-RC-BA-24290
Maybe some of this will help. Also, there is a County Kerry burial resource: http://www.kerrylaburials.ie/en/index.aspx