Cathy,
This is the IGI entry for Agnes, her parents and siblings:
John Shanks, Husband, birth no mentioned
Isobel Shanks, Wife, birth about 1715 New Monkland
Children:
James, Christening: 27 JUN 1742 New Monkland, Lanark, Scotland
James, Birth: 10 FEB 1745 New Monkland, Lanark, Scotland
Agnes, Birth: 16 AUG 1747 New Monkland, Lanark, Scotland – Probably died before 1752
William, Birth, 12 NOV 1749 New Monkland, Lanark, Scotland
Agnes, Birth, 09 FEB 1752 New Monkland, Lanark, Scotland