It?ll be tricky tracing these families for certain. RC marriages weren?t entered into the statutory registers till 1864. Prior to that all you have to rely on are the RC church records which tend to have very limited information ie the couples names, the date and their 2 witnesses. So no parents names, addresses etc.
There are a couple of gravestones in Aughnahoy RC graveyard, Portglenone, that might relate to your family. Each gravestone is listed under O?Hara and Rainey, both of which are names in your family. Aughnahoy is just a few miles from Ahoghill.
J.H.S. Erected In memory of William Rainey Of Rosegift who died 25th Of January 1861 aged 80 years also of his wife Bridget Rainey who died 23rd January 1827 aged 35 years
I.H.S Erected by Margaret Hampshire In memory of her father Henry Rainey of Rosegift Who died 1st January 1873 Aged 78 years Also her mother Cthrine Rainey Who died 1st February 1878 Aged 80 years Lizzie G. O'Hara Died 10th August 1900 aged 22 years John O'Hara Died 10th September 1915 Mrs. Cecilia O'Hara Died 18th November 1913 Requiescant In Pace
If there?s a connection, the ages might make John O?Hara and Patrick William O?Hara brothers.
http://www.census.nationalarchives.ie/pages/1901/Antrim/Lisnagarran/Bracknamuckley/940254/
http://www.census.nationalarchives.ie/pages/1911/Antrim/Lisnagarran/Bracknamuckley/123611/
2 probate abstracts. (The full files are held in PRONI in Belfast).
Letters of Administration of John O'Hara late of Bracknamuckley, County Antrim, farmer, who died 20 September 1915 granted at Belfast to Mary Anne Henry, Lisnagrot, County Londonderry, married woman. Effects: ?293 15s 0d.
Rainey, William John of Bracknamuckley Portglenone county Antrim retired farmer died 2 March 1963 at County Hospital Cleland Lanarkshire Scotland Probate Belfast 12 June to Peter Cassidy and Michael O'Neill farmers. Effects ?1585 9s.