<p>Consider the following prolog logic program:</p><p>mother (mary, sue).</p><p>father (john, sue).</p><p>mother (mary, bill).</p><p>father (john, bill).</p><p>mother (sue, nancy).</p><p>father (bob, nancy).</p><p>mother (sue, jeff).</p><p>father (bob, jeff).</p><p>mother (jane, ron).</p><p>Father(bill,ron).</p><p>Parent(A,B) :- father(A,B).</p><p>Parent (A,B) :- mother(A,B).</p><p>Grandparent(C,D) :-