If you are searching for snippets of information post 1910, one avenue you could go down is to try a google: "Ancestry - Glasgow Electoral Registers". These records often only give the head of the house and what address he or she was living at. But they go up to the early 1960's, and sometimes they do tell you names of other people living at the same address. You can then try to investigate whether the other people were sons, or daughters etc.
I am already a member of Ancestry, and I find the easiest way to reach the relevant search page is to try the google. Then, all you do is type in the name of the person you are searching for, plus a date. However, if you are looking for a John Smith, this brings up countless possibilities, but if the name you are searching for is more uncommon than that, then you have a reasonable chance of seeing where they were living, and possibly even who was living with them, just by using these registers. They sometimes also tell you what a person was working at.
...The registers helped me find my grandfather between the years 1926 and 1940.
