Hi Alison
I see your family tree here on A/try
www.ancestry.co.uk/family-tree/person/tree/178188040/person/342342621186/facts.
Have you looked at the censuses for the family?
Joseph Snr born c. 1871, I think this looks like the family's 1901 census entry after his marriage to Mary McIntyre:
Joseph Thomson 29 Cotton Mill Worker b. british subject, America (the original image would help here to confirm what it says)
Mary Thomson 27
Joseph Thomson 9
John Thomson 7
Mary Thomson 5
Euphemia Thomson 3
Jane Thomson 2
Address: 75 New Street, Rutherglen, Lanarkshire
Have you found him in 1891 after his marriage? Was this in 1889 in Dennistoun, Glasgow?
Added: 1891
Joseph Thomson 22 Cotton Worker b. Glasgow
Mary Thomson 17 Wife b. Glasgow
Jane McIntyre 9 Visitor
Address: 11 Trafalgar St, Bridgeton Glasgow
Monica