First given name, age, place of birth, estimated year of birth, from the 1841 Scotland Census taken on the night of 6 June 1841 for the Dalkeith Parish, County of Midlothian, Scotland, found in September 2023:
Address: High Street
James Laidlaw, age 40, Wright [a skilled craftsman], Born Midlothian Scotland [circa 1801]
Margaret Laidlaw, age 40, Born Midlothian Scotland [circa 1801]
Elizabeth Laidlaw, age 5, Born Midlothian Scotland [circa 1836]

More on place of birth, different year of birth, from the 1851 Scotland Census taken on the night of 30 March 1851 for the Coldstream Parish, County of Berwickshire, Scotland, found in September 2023:
Address: The Hirsel
James Laidlaw, Head, age 50, Joiner [a highly skilled carpenter commonly worked in the construction or furniture making industries], Born Midlothian Scotland [circa 1801]
Margaret Laidlaw, Wife, age 55, Born Edinburgh Midlothian Scotland [circa 1796]
Elizabeth Laidlaw, Daughter, age 14, Scholar, Born Dalkeith Midlothian Scotland [circa 1837]

Maiden name, date and place of marriage from the Scotland, Marriage records found in September 2023:
Marriage Date: 28 August 1829
Marriage Place: Saint Cuthberts, Edinburgh, Midlothian, Scotland
Groom: James Laidlaw
Bride: Margaret Blackstocks

Name, date and place of birth and death, place of burial, photo of headstone, from Find a Grave website found in September 2023:
https://www.findagrave.com/memorial/218795793/margaret-laidlaw
Margaret Blackstocks Laidlaw
Birth: 1796, Edinburgh, City of Edinburgh, Scotland
Death: 26 Mar 1874, Ford, Northumberland Unitary Authority, Northumberland, England
Buried: Lennel Old Churchyard, Coldstream, Scottish Borders, Scotland
Inscription:
ERECTED by Margaret Laidlaw
in Memory
of JAMES LAIDLAW
her husband who died
at Coldstream 2nd Octr. 1858
aged 57 years
Also of MARGARET LAIDLAW
wife of the above who died
at Sandyfords, Ford on the
26th March 1874 aged 77 years