Hi again..There is a robert mitchel who married janet taylor in 1776 at marykirk..they had 2 daughters (Ann and Janet) born 1777.
Maybe

my Robert was maybe born in Marykirk to David and Jean but baptised in Montrose..
There is no Robert born to robert and janet in 1784 that I can find..
Please, if you can set my search right it would be greatly appreciated.
I have robert mitchell ( my GG father coming from Edzell, Forfarshire ..born 1809)
His army records state the fact as well as saying coming to hobart town
He retired after 25 years in the army in Feb 1861 , coming home to edzell, hence the 1861 census.. then getting a passport number
His death cert. from Tasmania does not state his parents unfortunately..
Thankyou for your anticipated help Ruth.