Thank you! The John I mentioned at the top is the husband of Catherine. I don't have any information on him, other than his name on the birth registrations of the children. I would assume he was born between 1830 and 1850, and he was married (probably) to Catherine, who was born in 1848. I know he died before 1923 because that's when Charles married, and it's listed on his marriage registration.
I think Joseph may be another child of this couple. I found a potential 1901 census in Glasgow, listing:
Joseph Fee, aged 20, born Ireland, telephone labourer
Catherine Fee, aged 50, born Ireland (mother)
Catherine Fee, aged 17, born Ireland, machinist (sister)
Charles Fee, aged 15, born Ireland, box maker apprentice (brother)
Peter Fee, aged 18, born Ireland, telephone labourer (cousin)
The only thing holding me back is that my cousin knows that Charles went to Glasgow when he was 12, to work be a labourer digging roads (that's what my cousin has been told about her ancestor), and the Charles in this census, at 15, is a box maker (apprentice). When he married in 1923, he was a grocer. I don't know what a box maker is, but woodwork makes sense to me. Nobody in the above family was involved with road construction or groceries, unless maybe the telephone labourers were laying telephones along the roads???
I can't find any of these individuals in 1911, so I'm having trouble verifying them.
Thank you again! My cousin is very grateful!