Hi Nigel, I found a marriage for Hugh Barclay and Helen Thomson, 11 oct 1858, New Monklands, Lanarkshire,
Children found in IGI
. AGNES MARSHALL BARCLAY - International Genealogical Index / BI
Gender: Female Birth: 12 MAY 1861 Tradeston, Glasgow, Lanark, Scotland
51. JOANNA JANET WRIGHT THOMSON BARCLAY - International Genealogical Index / BI
Gender: Female Birth: 01 DEC 1866 Central District, Glasgow, Lanark, Scotland
52. JOHN JAMES THOMSON BARCLAY - International Genealogical Index / BI
Gender: Male Birth: 25 OCT 1869 Central District, Glasgow, Lanark, Scotland
53. DAVID BARCLAY - International Genealogical Index / BI
Gender: Male Birth: 10 JUL 1873 Govan, Lanark, Scotland
54. MARGARET THOMSON BARCLAY - International Genealogical Index / BI
Gender: Female Birth: 10 AUG 1859 Tradeston, Glasgow, Lanark, Scotland
55. HUGH MARSHALL BARCLAY - International Genealogical Index / BI
Gender: Male Birth: 15 FEB 1864 Tradeston, Glasgow, Lanark, Scotland
1861 name index Glasgow
Census taken TRADESTON, 644/9 enum dist. 91 page 14
Hugh Barclay age 32 born Kilmarnock
Helen age 25 born Glasgow
Margaret T age 1 born Glasgow, Tradeston
1861 census taken Glasgow Central, 644/1 Enum dist. 80 page 15
Looks like it could be Hugh's parents.
Hugh Barclay age 58 born Kilmarnock
Agnes age 55 born Balfron, Dunbarton
James age 25 born Kilmarnock
David age 15 born Glasgow.
You'll notice how two of Hugh and Helen's children have Marshall in their name, There was a Hugh Barclay married to Agnes Marshall 23 jun 1826 Kilmarnock
Marriages and births were found in
www.familysearch.org1851 name index has no birthplaces, but again, this looks like your Barclay family
Census taken INNERHIGH ward 555 enum dist. 21 page 1
Hugh Barclay age 48
Agnes age 45
Hugh age 22
Elizabeth age 17
James age 15
David age 5
Now you have a lot of homework to do
Liz