In 1841 there is the following Smith & Gillies families in the same household…..
Kilcraigan Farm, Rosneath, Dunbartonshire
John Smith 50 b Dunbartonshire
Flory Smith 45 b Scotland
Margaret Smith 16 b Dunbartonshire
Mary Smith 14 b Dunbartonshire
Duncan Smith 13 b Dunbartonshire
Donald Smith 8 b Dunbartonshire
Flory Smith 7 b Dunbartonshire
Catherine Smith 4 b Dunbartonshire
Archibald Gillies 35 b Scotland
Catherine Gillies 30 b Scotland
Duncan Gillies 12 b Scotland
Alexander Gillies 2 b Dunbartonshire
JohnGillies 5 b Dunbartonshire
Looks like the same Archibald in 1861
Woodside Cottage, Rosneath, Roseneath, Dunbartonshire
Archibald Gillies Head 58 Shoemaker b Kilmartin, Argyllshire
Catherine Gillies Wife 50 b Argyllshire
Duncan Gillies Son 30 Shoemaker b Lanarkshire
Jane Hamilton Daughter 27 b Dunbartonshire
John Gillies Son25 Shoemaker b Dunbartonshire
Alexander Gillies Son 22 Joiner b Dunbartonshire
Mary Gillies Daughter 16 b Dunbartonshire
James Gillies Son 9 Scholar b Dunbartonshire
William Hamilton Son-in-law 28 Mason St Andrews, Fife
Archibald Gillies Hamilton Grand son 0 b Dunbartonshire
Margaret Wilkie Visitor 34 Slater's wife b St Andrews, Fife,
David Lowie Boarder 50 Shoemaker b Fife
Jo