Hi,
I just discovered that Ann, the eldest daughter of Alexandre Martin and Marie Jenkins was born about 1860 in Kouchibouguac, Kent County, New Brunswick. Also that the parents Of the Ann Martin who witnessed the marriage of Alexander Martin and Marie Jenkins were a Michel Martin and a Nancy Nolan. This is likely the Nancy Martin, 81, living with Alexander's family in 1881 in Northumberland County..
Perhaps in 1861 Marie and Alexander were living in Kent County. I don't know if you included Kent County in your 1861 census search for Alexander Martin.
Electron
