Martha Mussen Collins, born 14 May 1901, Longfield, Desertmartin parish, died 22 April 1919, Grange, Cookstown. Her parents where John Witherow Collins of Longfield and Agnes Smyth, daughter of Alexander Smyth of Grange, Cookstown. They married at Cookstown 2nd Presbyterian on 31 Oct 1899.
John Witherow Collins was born 12 Nov 1868, Longfield, to Stewart Collins (c1840-1893) of Longfield and Mary Crosset (c1839-1879), daughter of Richard Crosset of Coolshinney, Magherafelt. Stewart and Mary married on 4 Jun 1867, Magherafelt Presbyterian Church.
Stewart Collins was born around 1840 to John Collins (c1799-1881) of Longfield and a Martha (c1803-1889), and died on 9 Jan 1893, Longfield. According to someone else on this site John Collins was the son of John Collins and Mary Witherow. John's likely father was a James Collins of Longfield (c1760-1851).
I will add that the John Collins and Martha and John Collins and Mary Witherow information gleaned from the other thread linked to already in this discussion is quite suspect and I have reason to believe that John and Martha and John and Mary Witherow are the same people. Or that instead of John and Mary Witherow it should be James and Mary. It is quite confusing and we'll probably never find out.