Think I have found a chink of light for you...
The names are a bit of jumble, which always throws us off when trying to work back.
I found this 1901 census entry to start with:
David Aitkin 20 (age mis transcribed I believe) coal miner b. Kirkintilloch, Dunbartonshire
Christina Aitkin 26 b. Kirkintilloch, Dunbartonshire
Annie Aitkin 8 b. Kirkintilloch, Dunbartonshire
Bella Aitkin 7 b. Kirkintilloch, Dunbartonshire
Alex Aitkin 7 Months b. Kirkintilloch, Dunbartonshire
David Aitken Marshall married Christina Gibb in 1898 in Kirkilloch. This is from the birth of Alex above, in September 1900.
David Aitken Marshall married Marion Mclean in 1892: