Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### 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"