Yes, I think so. Maybe this is a good sign, if they were brothers that age gap is perfect.
I couldn't find a death record for Alexander McIntyre (father) but the 1851 Census shows Dorothy McIntyre, aged 72, and in the same household Alexander, aged 0 and Dorothy, aged 2.
542/ 1/ 4
Kilfinichen and Kilvickeon
Argyll
Flory (daughter of Alexander McIntyre and Dorothy) married Alexander McQuarie. This is their daughter
MCQUARIE
DOROTHY
ALEXANDER MCQUARIE/FLORA MCINTYRE FRMRV79-1
F
04/05/1844
544
20
Kilninian and Kilmore
MCQUARIE
DOROTHY
ALEXANDER MCQUARIE/FLORY MCINTYRE
F
04/05/1844
544
20 / 65
Kilninian and Kilmore