Leopold VI, Duke of Austria is the father-in-law of which person?
CREATE TABLE table_name_26 (spouse VARCHAR, father VARCHAR)
SELECT spouse FROM table_name_26 WHERE father = "leopold vi, duke of austria"
### Context: CREATE TABLE table_name_26 (spouse VARCHAR, father VARCHAR) ### Question: Leopold VI, Duke of Austria is the father-in-law of which person? ### Answer: SELECT spouse FROM table_name_26 WHERE father = "leopold vi, duke of austria"