Dunbar Douglas, 4th Earl of Selkirk Scottish peer (1722–1799) Parents Isabella Mackenzie Basil Hamilton Children Basil William Douglas, Lord Daer Lady Katherine Douglas Thomas Douglas, 5th Earl of Selkirk Lady Elizabeth Douglas David Douglas John Douglas, Lord Daer Alexander Douglas Dunbar Douglas Helena Hall Sholto Basil Douglas, Lord Daer Siblings Basil Hamilton Mary Hamilton unknown daughter Hamilton Partners Helen Hamilton