Hi Jorose
Many thanks for picking up my post and responding so quickly.
There is no evidence to support Donald as being a mariner although he and Karoline were, seemingly, married on a boat. In the 1901 Census Donald was living in Inverness, Scotland and was a butcher's assistant. In the 1911 Census he was living in Kinlochleven, Scotland with Karoline and their first child John born 1909. I don't have his occupation at that time. From another Ancestry Family Tree I discovered he was a furnace foreman in 1938.
The places of birth for three subsequent children, after John, were Firda, Firda and Kristiansund, Norway respectively. Their remaining four children were all born in Kinlochleven, Scotland.
The information I have for Karoline has been sourced from other trees on Ancestry, with information sourced by a 'professional genealogist', and her place of birth is given as Firda, Norway. She died in Lewisham, London on 9 June 1963, which I have confirmed from the Probate records on Ancestry. John predeceased her on 22 December 1955.
I hope this helps.
Regards
Chiad Fhear