Born 7 December 1864, Bothwell, Lanarkshire the daughter Robert Porteous & Barbara Brown. (Scotland Births & Baptisms https://www.familysearch.org/ark:/61903/1:1:FQH9-BF6)
This miscellaneous document:
Birth of Barbara Porteous (2nd) from Registar of Births for the District of Holytown, Burgh of Bothwell in County of Lanark:
Barbara Porteous, born 1864, December 7th, at 5:00 PM at Newarthill, Parish of Bothwell, female, Father: Robert Porteous, Coalminer, Mother: Barbara Porteous, M.S. Brown, married 1840 October 12th at Airdire. Informant: Robert Porteous, Father.
Registered 10 Dec 1864 at Holytown.