Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Leopold VI, Duke of Austria is the father-in-law of which person?

### Inputs:
table_name: table, columns: ['Father', 'Birth', 'Marriage', 'Became Queen', 'Ceased to be Queen', 'Death', 'Spouse']

### Response:
SELECT Spouse FROM table WHERE Father = leopold vi, duke of austria