Morning Andrew,
I am thrilled to be in contact with you but need a bit more information. I think you said in your private message that your grandfather was Robert and his grandfather James but I could really do with a bit more information before I can work out which family you are referring to. The 2 main Sutherland families with interests in the West Indies were the Sutherland of Uppat family and the Sutherland of Langwell family. Both had Robert Sutherlands in them.