Hi Ross,
my mother lived near Buchlyvie as a child, Betty (Martin) was her school friend (still is!)and in later years I spent childhood weekends at Arngibbon, Blackhouse and Redlairdston playing with Mary, Janet and their sisters and cousins.
I have emailed Mary to ask if I can put you in touch with her for news of the family - not sure how I can contact you privately, do you have to put your email address on the forum or what? Not sure how that works.
Are you in the UK? I could phone or text you - -?