Thank you very much for the information posted on the genealogy.com on the Dunkley Family in Jamaica, WI.
From the information you posted "..three Scottish brothers, from Glasgow, who was a ship's captain in the 1750's and engaged in the slave trade between W. Africa and the States, calling at Jamaica." It seems to be the most important piece information that has yet to be discovered when tracing the Dunkley family back to its Scottish roots.
One of my Aunts acknowledged that there is some merit in your details, and went further to state that the ships sank off the Jamaican coast and the family was left stranded in Jamaica where they later settled.
Does your wife have any additional information on the descendants of Edgar Oliver Dunkley that she could share with the rest of the extended family? We anxiously await your response.