Premise: Mary Balfour Herbert (1817–1893) was a British artist. She was born Mary Balfour in 1817, the daughter of James Balfour MP and Lady Eleanor Maitland; they were grandparents of Arthur Balfour 1st Earl Balfour. She grew up in Whittingehame House, East Lothian, Scotland, and travelled widely during her childhood. She took drawing lessons but had no other formal art education.
Hypothesis: Mary Balfour Herbert was an only child.