Date of photo and age of unidentifed lady with baby?

[Isabel H]

The earliest known record of Fairbairn & Phimister at the Glasgow address is 1906 and the latest 1914 ( but possibly a bit later); see -
http://thelows.madasafish.com/alpha/EFs.htm#btm

That is useful, thank you.

[Isabel H]

Jayhen6, thank you too.
Based on what I know, g grandmother's sister does seem the most likely person. Now to see what I can find out about her.