Sir John Erskine of Otterstoun person associated with the witch trials in Scotland Parents Marie Stewart, Countess of Mar John Erskine, 18th Earl of Mar Children Siblings Lady Margaret Erskine Lady Mary Erskine James Erskine, 6th Earl of Buchan Henry Erskine, Master of Cardross Lady Catherine Erskine Lady Anne Erskine Sir Charles Erskine of Alva John Erskine