Henry Alexander Douglas (1781-1837) (1781–1837) Parents Sir William Douglas, 4th Baronet Grace Johnstone Children Eliza Douglas Edward Douglas Robert Johnstone-Douglas of Lockerbie Henry Douglas John Douglas Siblings Charles Douglas, 6th Marquess of Queensberry unknown daughter Douglas John Douglas, 7th Marquess of Queensberry unknown daughter Douglas unknown daughter Douglas Lord William Douglas Lady Mary Douglas Partners Elizabeth Dalzell