I have been researching McCahon Family around Kilrea and have produced a family tree back to George that includes the information you mention (see below). Have you additional info on this family? I would particularly like info on George McCahon's parents etc.
One last thought, I have never come across McCaughern/McCaughrn confused with McCahon. Are you sure they are the same?
Many thanks
Marriage 1 June(?) 1861 @ Boveedy Pres. Church
George McCahon , Weaver of Boveedy (Father Robert McCahon, weaver)
To
Mary Jane Michil of Boveedy (Father, John Michil, occupation unknown)
Children (details from BMD site with some confirmation from other sources)
8.7.1861 James William, baptised at Boveedy Pres.
(father listed as George McCahon married to Margt Jane Michel)
13.6.1865 Robert John ,birth registered @ Kilrea, baptised @ Boveedy Pres
(father listed as George McCahey married to Margaret Michael)
Robert John married Mary Morell 20.1.1887-----My great grandparents
17.6.1870 Martha McCahey, birth registered @ Garvagh
(father listed as George McCahy married to Margaret Michael)
Martha married James McLaughlin 4.7.1889
15.3.1873 George McCahon birth registered @ Ireland
( father listed as George McCahon married to Margaret McMichael McCahon)
12.8.1874 James McCahon birth registered @ Garvagh, baptised @ Garvagh Pres.
( father George McCahon married to Margaret Michael)
26.7.1877 Nancy birth registered @ Desertoghill
(father George McCahon married to Margaret Michael)
From BMD Data ----Is this same couple?
George McCahon X Elisabeth Micheal
Children:
24.10.1867 Elisabeth birth registered @ Garvagh, baptised @ Garvagh Pres
(Possible marriage: Lizzie McCahon X Joseph Fleming 3.10.1895 @ 2nd Kilrea Pres)