I have contacted the Irish General Register Office with the details on Denis Francis Kennedy born in Borrisokane, County Tipperary. They found that his date of birth was August 1891 and there is no Denis Francis Kennedy or Denis Kennedy with 26th July 1890 (or any similar date in 1890) as his date of birth. I have looked through the Irish GRO website and the only other Denis Kennedy born in July in the 1890s was born on 25th July 1897 in Dublin. I have also checked for Francis Kennedy but found no similar information.
The 1939 Census on Find My Past appeared to have Denis Kennedy's date of birth as 1890 at first glance - it appeared when I looked more carefully that the date might have been 1896, the 0 looked a bit scruffy and I thought it might have been a 6. However, when I was looking down the page, other 6's appeared to be written more clearly.
Does anyone have any other suggestions about how I can find a record for Denis Kennedy?
Thanks.