Given the information that Jane was Mother to Ellen Wilson Scott Heron born in 1920 and Monicas information, I think this is the family
MARRIAGE 2 July 1867 Penninghame
William SCOTT to Helen / Ellen WILSON
Children with birth records that I could find
(there are others missing)
John Scott b. 3 Sept 1867 Mochrum, WIG
Jane Scott b. 1 Jan 1870 Penninghame House, WIG
Ellen Scott b. 9 Jan 1872 Penninghame House, WIG
William Scott b. 11 Jan 1874 Penninghame House, WIG
Thomas Purdie Scott b. 26 Dec 1880
1871 census 44 King St Newton Stewart, WIG
William Scott 25 born Newton Stewart, Ag Lab
Helen Scott 23 born Newton Stewart, wife
Jean (Jane) Scott 1 yr daughter
1881 Census 9 Challoch cottage Penninghame, WIG
William Scott, 32 born Penninghame, Ag lab
Ellen Scott, 28 born Penninghame, wife
Jane Scott, 11 born Penninghame
William Scott, 7 born Penninghame
Elizabeth Scott, 5 born Penninghame
Ellen Scott, 3 born Penninghame
Thomas P. Scott, 3months born Penninghame
1891 Census Boreland Cottage, Kirkinner, WIG
William Scott. 40 born Penninghame, farm labourer general
Helen Scott, 38 born Penninghame
William Scott, 17 born Penninghame, farm lab
Elizabeth Scott, 14 born Penninghame, farm lab
Helen Scott, 12 born Penninghame
Thomas Scott, 10 born Penninghame
Alexander Scott, 8 born Penninghame
Samuel Scott, 6 born Minnigaff, Kirkcudbrightshire
James Scott, 4 born Mochrum WIG
William Scott born 22 Nov 1848, bapt 5 Oct 1849 Penninghame
Son of William Scott and Grace Tongue who were married 15 Apr 1836 Penninghame
Helen Wilson baptised 1 Nov 1854 Kirkinner
Daughter of Alexander Wilson and Elizabeth / Betty Anne Dorrans who were married 7 June 1852 Kirkinner