Ev, I was seeing those parents also, which is why on checking on IGI, it brought up these births:
1. JAMES ALEXANDER WALKER Birth: 19 JUL 1860 Lower Cumber, Londonderry
2. MARY MARGARET WALKER Birth: 22 JAN 1862 Lower Cumber, Londonderry
3. ISABELLA WALKER Birth: 04 NOV 1863 Lower Cumber, Londonderry
4. MAJOR WALKER Birth: 28 AUG 1865 Lower Cumber, Londonderry
5. ELIZA JANE WALKER Birth: 09 APR 1868 Lower Cumber, Londonderry
6. CATHERINE WALKER Birth: 14 AUG 1869 Uphall, West Lothian
7. GEORGE WALKER Birth: 11 DEC 1870 Uphall, West Lothian
8. WILLIAM DUNLOP WALKER Birth: 11 JUN 1872 Uphall, West Lothian
The Scottish birth certficates will let you confirm place and date of parents marriage in Ireland
