Hello James,
There may have been more than one Isabella Bannigan living in Glasgow (the name Isabella appears to be reasonably common in the Bannigan tree).
You say that half of what has been posted is "rubbish", can you let me know where the common ground is?
The younger woman in each of the photographs is Isabella Bannigan who married John Bissette and is not your "ma".
I noticed that your surname is Bannigan. Is that your mother's birth surname or her married name? If it is her married name then any link to my part of the Bannigan tree will be through your father rather than your mother.
The ladies in the photographs are my grandmother, Isabella (nee Bannigan) and great-grandmother, Sarah (nee Miller), and knowing that I do not have an uncle James makes it pretty clear that you must be descended through another branch of the Bannigan family. Can you post some details of your family on this forum (or, alternatively, send me the details as a private message) so that I can try to find out if your Isabella was related to mine.
Deslaw