Among my ancestors of Glengarry County are many who were Baptists. I am trying to determine if they were part of the 1815 sponsored immigration or came later. Specifics: James Anderson (b. Scotland, c. 1773), his wife Catherine McEwan (b. Scotland, c 1785), and their daughter Catherine (b. Scotland, c 1812) who later married a John Anderson (b. Scotland, c. 1812) are all listed as Baptists in the census of 1851, as are two more who seem to be younger children: John (b. Canada c.1823) and Jenet (b. Canada, c1830). If these assumptions are right then the emigration would have occurred between 1812 and 1823 and given what I've learned about the Baptist immigration from Perthshire, probably between 1815 and 1820, yet I don't see them on the ships lists of 1815.
Can anyone help me find when and from where they came to Glengarry? Is anyone else related to these Andersons?