Write axioms describing the predicates Grand Child, Great Grandparent, Brother, Sister, Daughter, Son, Aunt, Uncle, Brother In Law, Sister In Law, and First cousin. Find out the proper definition of mth cousin n times removed, and write the definition in first-order logic. Now write down the basic facts depicted in the family tree in Figure 8.5. Using a suitable logical reasoning system TELL it all the sentences you have written down, and ASK it who are Elizabeth?s grandchildren, Diana?s brothers-in-law, and Zara?s great-grandparents.

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George M Mum Elizabeth M Philip Spencer M Kydd Margaret Diana MCharles Anne M Mark Andrew M Sarah Edward Zara Beatrice Eugenie William Harry Peter