In these exercises you should work with the relative database presented at the beginning of this chapter.
a. Write a rule (i.e. predicate) that describes the relationship of a sibling. Then write a query to find out if Anne and Stephen are siblings. Then ask if Stephen and Mike are siblings. What is Prolog’s response?
b. Write a rule that describes the relationship of a brother. Then write a query to find the brothers of SophusW. What is Prolog’s response?
c. Write a rule that describes the relationship of a niece. Then write a query to find all nieces in the database. What is Prolog’s response?
d. Write a predicate that describes the relationship of cousins.
e. Write a predicate that describes the relationship of distant cousins. Distant cousins are cousins that are cousins of cousins but not cousins. In other words, your cousins are not distant cousins, but second cousins, third cousins, and so on are distant cousins.
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