Hello TunjiLees
I think you are absolutely right that your ancestor Robert Robertson is related to my Robertson ancestors. I do not know where your Robert fits in but im pretty sure he would have been a son or nephew of my Hugh Robertson who was born in Errol in 1769.
I have often wondered if Hugh was married firstly to Elizabeth Will but i've not had any conclusive proof yet but perhaps it's time to start searching again.
I'm descended from Hugh and Mary's son Thomas Robertson, yes the Thomas who bought lair 51 and i suspect that Robert and Thomas were half brothers or possibly cousins.
I'll have to dig out the tree again and get back to you on a few things but i wonder if we could check on the naming pattern of Robert and Katherine's children and see if there would be a link there to older generations that lay undiscovered to us.
Kat