Hi stovie,
Think this is your Dochertys in 1891:
Address: Coatbank Street, 5 John Brown's Land, CoatbridgeThomas Docherty, m, head, 39, furnacekeeper, b. Ireland
Mary Docherty, f, wife, 35, -, b. England
Mary Docherty, f, dau., 10, scholar, b. England
James Docherty, m, son, 5, scholar, b. Coatbridge
Thomas Docherty, m, boarder, 40, ironworker, b. Ireland
[note; There are marks over both Thomas Dochertys' ages, so very hard to make out.]
Mary Docherty (m.s. Costello) died 10th December 1894 in Coatbridge, aged 38. She was the daughter of James Costello, puddler (deceased) and Bridget Costello m.s. Keenan (deceased).
A re-marriage for Thomas between then and 1901. Certificate should be available to view on SP and will give parents' names.
Address: 93b Buchanan St, CoatbridgeThomas Docherty, m, head, 49, iron puddler, b. Ireland
Jane Docherty, f, wife, 38, -, b. Coatbridge
James Docherty, m, son, 15, pithead worker, b. Coatbridge
Sarah Jane Keegans, f, niece, 12, scholar, b. Motherwell
Michael McLean, m, boarder, 40, coal hewer, b. Coatbridge
Hope this helps.

hume