Many thanks for the replies.
The separation mentioned in my first post was from the army.
There is a bit of a mystery surround Joseph Dougan. Surviving family members (all grandchildren) were led to he died about 1937 but I can find no evidence of it. I have found an entry of a Joseph Dougan dying in Royal Victoria Hospital on 12 Jan 1941 and, although there are some positive points, I am unable to confirm this is the correct Joseph Dougan. I am also unable to locate the burial record of the Joseph Dougan who died on 12 Jan 1941. My 'Ancestry.com' tree currently has the 1941 death listed as a possibility. All the 1937 listed deaths have originated from the unsubstantiated family 'belief'.
The birth record link below on Irish Genealogy shows a DOB of 25 March 1886. His baptism record though (obtained from the Church) shows he was baptised on 21 March 1886 with a DOB of 18 March 1886. Just to muddy the waters even further, I have possession of some of his military documents where his DOB is listed as 4 March 1886. I am inclined to lea towards the baptism record.
It seems that Joseph Dougan's wife and children did not speak about him at all to his grandchildren over the years and there is some speculation mounting now that he may have left his wife and family in the late 1930s.
As I say, I have put together quite a good timeline on him now from birth until when he left the army in 1929. I also just found a record in the Belfast Street Directory which showed him at the family home (Donegall Gardens, Belfast) in 1932. Whatever happened to him (either died or ran out on the family) seems to have occurred between 1932 and 1937.
Any further assistance is most appreciated.
Regards,
David