As I am simply a guest member (unfortunately) I am unable to view the linked gedcom file. What I can tell you, though, is David Garrison (17 Feb 1777 - 07 Apr 1842) was the brother of Levi Garrison (10 Jan 1779 - 1855). Levi Garrison's unmarked grave http://s13.postimage.org/txd6qsyo7/Levi_Garrison_Grave.jpg and David Garrison Graves http://s7.postimage.org/odwb9yoyj/David_Garrison_Graves.jpg
As for Nancy Garrison, she was the sister-in-law of David. Her maiden name is Morgan (1780 - Feb 1835) and was married to brother Thomas Wesley Garrison (18 Jan 1780 - 17 Oct 1864).
I hope this helps...
