McLaughlins in Camden Township, Lennox and Addington County, Ontario, Canada

My 3x great grandfather, Daniel McLaughlin m. Jane McCauley (b. ca. 1794, Ireland) and died in Camden in August 1858.  Jane died in July 1872.  They had six children in Ontario that I know of:  Margaret, born Nov. 1822 in Bath, Ontario, who married John McKeown, had 7 children, and died 1902 in Richmond Township, Hastings County, Ontario; John, b. ca. 1829; Mary Jane b. ca. 1832; Daniel b. April 1835; Dennis who married Mary Ann Reynolds in 1849 in Centreville, Ontario and had at least one child, Elizabeth b.Dec. 1850 in Camden, Ontario; and William who married Margaret Lappan in 1849 and had at least one child, Elizabeth, born 1849. 

I do not know where Daniel and Jane married or when they came to Canada, or even where they came from.  I have searched land records, census records, ships lists, and church records.  Any suggestions welcome.