I'm affraid I don't know your David Mckee, the one I know of in my family, is younger.
But, I am also looking for help onmy Mckee family who lived in Hull.
I was once told by a certain Phil Wilson, who I have unfortunately lost contact with, that there was 3 distinct Mckee families in Hull.
Have you by any chance come across my great grandfather, George Mckee, he could have been born around 1870-1890, he had 5 sons, George, Arthur, Eric, William, and Victor (my grandad)..born 1920-1976, married Phylis Thompson, married 1940. Had 4 children, Victor (John), Mararget, Ken and Barbara
Your David and Agnes, could have been related to my 'lot' maybe !
Any lead would be greatful, I am having a prob. getting started through lack of info.