Regarding John Wilkies and Isabella, certainly looks like her surname may have been McLean. There is a submitted entry on IGI with these details:
ISABELLA MC LEAN Birth: 14 MAR 1861 Aird, Muckairn, Argyll, Scotland
Parents: HECTOR MCLEAN and CHRISTIAN TURNER
Also this possible 1861 entry:
Hector McLean 21, lab. tenant b. Kilbrandon, Argyll
Christian McLean 21 b. Muckairn
Isabella McLean 1 Month b. Muckairn
Mary McKichen 71, dairy maid b. Torasa McUll, Argyll
Address: Aird, Muckairn
Monica