Looking for Parish

Sorry Susan
I had a search for these records but came up empty!
None of the birth or marriage records are on www.rootsireland.ie/
The early Irish Censuses (free online) don't have either name in Fermanagh.
No luck on ancestry or Family Search either.
The Tithe Applotments (free online) have 1 John Cox in Fermanagh 1827:
Surname Forename Townland/Street Parish County Year
Cox John Aughriskilla Tomregan Fermanagh 1827
There are no Summers but 66 Coxes in Griffiths Valuation (free) in Fermanagh in various parishes.
PRONI name search (free) has 6 Summers in the 1760's but none in Fermanagh but it does have 5 Cox records in Fermanagh - 2 in Devenish, 2 in Largey & 1 in Kinawley.
Col

You will probably find the surname spelt Somers. This entry is from the Fermanagh Gold site

http://www.fermanagh-gold.com/

Not your immediate family but the name Charles may be a relative.

Maguiresbridge C of I

No. 157
Sacred | To the memory | of MARY SOMERS beloved wife of JAMES SOMERS
| Who departed this life 27th January 1872 | Aged 61 years | This
stone is erected by her sons | FRANCIS and CHARLES SOMERS | Now of
Toronto, Canada | as a tribute of respect to a loving | and
affectionate mother

Bob Graham

There are 8 Somers in Fermanagh 1901. All are in the parish of Aghalurcher, 6 in Grogey, 1 in Corrylongford and 1 in Drumgoon.

http://www.census.nationalarchives.ie/search/

There are over 1000 Somers scattered over Ireland in 1901.

There are 2 Charles in Cavan in 1821.

Bob Graham