You could check the records on
https://www.scotlandspeople.gov.uk free to seach, small fee to view, the 1861 census below may help, 1871 census on freecen states all born Easdale.
1861 Easdale, Island Of Seil, Kilbrandon-Kilchattn
Archibald MCLEAN Head Mar 38 Slate Quarrier b Kilbrandon Argyllshire
Ann MCLEAN Wife 38 b Kilbrandon Argyllshire
Margaret MCLEAN Dau 16 Domestic Servant b Kilbrandon Argyllshire
John MCLEAN Son 14 Labourer Slate Quarries b Kilbrandon Argyllshire
Ann MCLEAN Dau 8 Scholar b Kilbrandon Argyllshire
Peter MCLEAN Son 6 Scholar b Kilbrandon Argyllshire
Archibald MCLEAN son 3 b Kilbrandon Argyllshire
Sarah MCLEAN Dau 1 b Kilbrandon Argyllshire
Colin