The family of McGuffie's you seek may be part of my husband's family but I have never been sure. I understand that a John McGuffie left Castle Douglas for New York before 1856. He was b.10 May 1813 and may have married Marion Kerr before leaving - if so I have traced 6 chn. Matthew Criag McGuffie his son (he added an 'a' - MacGuffie) married and had a son Robert Nichol MacGuffie b. 15 March 1888 d.1907. This Robert had 3 chn.
If you can throw any light on this family please contact me.