Try:
http://www.rootsweb.ancestry.com/~nbpstgeo/especially the search function for Low and Lowe. You may not find what you want, but you may find hints.
Also you need to learn to find your way around:
http://archives.gnb.ca/Archives/Default.aspx?culture=en-CAEspecially under 'Research Tools' is 'County Guides' at:
http://archives.gnb.ca/Archives/CountyGuides.aspx?culture=en...the guide for Charlotte Co. states that marriages 1789-1854 are on microfilm F-15476. This should be available through interlibrary loan.
I think you are looking for the family of John Lowe, a Loyalist, d. St. Andrews 2JUN1844 age 92, b. Scotland. See also:
http://www.nbgs.ca/firstfamilies/FAMILY-L-2006.pdfhttp://boards.ancestry.ca/thread.aspx?mv=flat&m=1545&...Thomas