ForeignKey Referencing Same Table

Question

There was an interview test in which below was the table and structure

 Table Person = id, name, dob, dod, mother_id, father_id
 Primary Key (id)
 Foreign Key mo         


        

Answer 1

SELECT * 
FROM Person 
WHERE father_id = (SELECT id FROM Person WHERE name = 'John Smith')
AND    mother_id = (SELECT id FROM Person WHERE name = 'Jane')