Don't Be Sidetracked by Online Family Trees Before Obtaining Basic Records

John asked this question:

" I've been seeking information on the parents of my great, great grandfather, John Barry. There, I've run into a brick wall. My information is from a family Bible record that goes back to 1810. John Barry married Johanna Harrington on 23 Feb. 1840 in Ireland. Witnesses were Daniel Harrington and Patrick Barry. The report identified the Diocesan Area as Cork & Ross and the Parochial Area as Durris (Muintervara). I know John and Johanna (I've found two spellings for her first name) had one child in Ireland who survived the trip to Canada in 1846. Family legend claims two children died aboard ship and were buried at sea. I've been told that local parish records in Cork prior to 1820 have been destroyed so I cannot pursue more on Patrick or Mary. Any ideas? I have found some possible death records on Ancestry.com that I can't authenticate. What might I try now?  John Barry, 1810-1880, married Johanna(?) Harrington, 1815-1883, on 23 Feb. 1840"

In response to a question I posed, John stated that he had found about 15 family trees on Ancestry but they had lots of incorrect information. 

1871 Census Caradoc Twp, Middlesex Co. Ontario

My response:

You can confirm that family lore by visiting the census records. I had a quick look on  Ancestry.com and found John and Johanna in Caradoc, Middlesex County in 1871. Living next door were John Harrington and wife Jane and family. John Harrington and Johanna are quite possibly siblings. 

In the 1861 Agricultural census John Barry and John Harrington are shown sharing (50 acres each) Lot 1 Conc. 8 in Caradoc. In 1881 Michael Barry, Johanna Barry and James Barry live next door to John Harrington and family. No doubt  John Barry died between 1871 and 1881.

You need to get the images for all these records and study the neighbours, occupations of individuals etc. For eg John Barry and John Harrington are noted as farmers - that means they likely bought land and your next step would be to check the CLRI *and* the Abstract Indexes to Deeds for more information on their land purchases! For help with the CLRI and the AI to D, see http://www.olivetreegenealogy.com/can/ont/clri.shtml

The death certificate of a daughter of John Harrington and Jane gives Jane's maiden name as Barry. It looks like siblings married siblings.  It seems you have a lot of records available to help you put these families together and learn more about them