Found birth cert for child John Robertson - parents William and Margaret (McKay) 3 years difference to what was on his death certificate.
Not a birth certificate but a baptism record. Birth certificates did not exist in Scotland before the start of statutory civil registration in 1855.
A small discrepancy in age between a birth and death is not significant. It just means that the informant didn't know the correct age of the deceased.
I found other siblings but am unsure of the difference in birthplaces?
Not sure what the problem is with this?
John, born 1828, Moy and Dalarossie
Donald, 1829, Alvie
Margaret, 1830, Kingussie and Insh
Angus, 1833, Kingussie and Insh
Mary, 1835, Alvie
These places are all parishes in the eastern part of Inverness-shire. Like many other families, the Robertsons moved around to places where there was work for William.
I also couldn't ascertain on Margaret's birth her fathers occupation? Please see attached.
Did you mean to attach the page with John's birth on it?
Still can't find a marriage for them - William Robertson and Margaret Mckay on Scotlands People website?
If you can't find it there you are not going to find it anywhere else.
There is a possibility that there was a family bible; a small chance that the bible survived; a still smaller chance that it is the hands of someone interested in the content; and an infinitesimally small chance that that person has put the information online somewhere. But in practical terms, if it's not on SP the marriage record, if it ever existed, has not survived.