There is a family tree on Ancestry for the line of Thomas, son of James and Janet. Have you got access to Ancestry (you need to have a subscription to Ancestry to view member submitted trees).
Quite a lot of info on Thomas on there including a photo of him and his wife Ena

The marriage for parents is showing in England in 1902. Janet is showing as having been born in St Albans (where the marriage took place) in 1874.
Thomas' birth entry should, as mentioned, let you confirm details.
From Ancestry's incoming passengers' database, Thomas looks to have made a trip back to Glasgow in 1930, arriving in Southampton on 14 Jun 1930 from Brisbane. His occupation is given a policeman which matches what is on the Australian Electoral rolls in the 1930s.
Monica