I found info on the Alexander clan on RootsWeb.com while looking for Henry Colclough.It would appear that Adam Alexander Sr. is your gg grandfather.According to the listing I saw he was born Oct. 25, 1795 in Chirnside, Berwickshire, Scotland to parents George Alexander b. 1760 in Chirnside, Berwickshire, Scotland and Elspeth Johnston. Adam Sr. married three times. First to Isabella Wilson, then to Agnes Robinsonnon on 28 Feb 1819 in Ayton, Berwickshire, Scotland.Adam Jr. is listed as their 7th of 8 children born 14 June 1833 in Howlaw Rigg, Berwickshire, Scotland.
Adam Sr. married Janet Dickson on March 25, 1842 in Coldstream, Berwickshire and they had two daughters while still in Scotland Christina Alexander b. 1843 and Janet Alexander b 1845. The info I have indicates that Adam Sr. settled in Hullett Township, Huron County, Ontario, Canada about 1850.In 1851 Adam was living with his 3rd wife and four children.It appears that Adam Sr. and Adam Jr. moved to Minnesota.In the 1870 census returns for Hultom Twp., Redwood County, MNAdam is listed as living with his youngest son Adam Jr.(who was apparently called "Alex" then.Adam Sr. died in Redwood County, MN in 1883.
Tou will find all this and more info on worldconnect at rootswebb.com and search for Henry Colclough and then click on the links to Christaina, Adam Sr. and Aadam Alexander Jr.