I too have turnbulls from Nova Scotia. Mine have settled in Western PA and some in Mass.
I have Obidiah and Obidiah Jr but not a Roderick. I show Obediah Sr as having been born in Glasgow, Scotland. Obediah Sr ggrandparents were Thomas Turnbull and Jane MacKay.
Thomas immegrated to Nova Scotia.
We probably have different Obidiahs.