Hi thanks everyone. I am having the records at PRONI searched D2908 & D2256 which holds genealogy records of the family back to 1612. In the papers are the following among other items:
There was an Indenture dated 18 May 1867. The parties were as follows:
1st part: Martha Dunn widow of James Dunn late of Drummond, son James Dunn, farmer and daughter Catherine Dunn, spinster, all of Drummond
2nd part: Mary Watson otherwise Dunn of Thornhill, widow and James Cherry, farmer and Ann Cherry o/w Watson his wife, of Thornhill
3rd part William Moore, farmer and Margaret Moore o/w Dunn of Drumreighland and James Creswell, farmer and Anne Creswell o/w Moore his wife, of Nedd
4th part: Abraham Patten, farmer and Eliza Patten o/w Dunn his wife and their daughter Anne Patten, spinster, of Crindle
5th part: Jane Turnbull o/w Dunn of Ballyspallen, widow and Joseph Douglass and Maria Douglass o/w Turnbull of Derrybeg
6th Catherine Smith of Ballyspallen, widow
The Indenture referred to the Will of Anne Dunn of Ballyspallen dated 30 Dec 1841. She had sons James Dunn, John Dunn of America who died before his mother; and married daughters Mary Watson, Margaret Moore, Jane Turnbull and Eliza Patten. She had 4 granddaughters called Anne - Cherry, Creswell, Patten and Douglass. The Will was granted in 1844. She left money to the Presbyterian Church.
Later in the box of papers I found a copy of the Will. Anne left her daughters £3 each to purchase mourning dress for her, but her son got £5 for his mourning dress!
The wedding cert of Margaret Dunn & William Moore mentioned 5 May 1824 is available from the following web site:
http://www.emeraldancestors.com/I find the above site very helpful in collecting Irish certs especially from Londonderry
Meanwhile if anyone finds further it would be of great help.