Exercise 3 queries:
1. sibling(alice, Y).
2. cousin(jake, Y).
3. grandparent(X, peter).
4. uncle(X, emma).
5. ancestor(robert, amy).
6. uncle(X, peter).
7. ancestor(robert, Y).
8. bigger_brother(X, emma).
9. older_sibling(X, tom).
10. mother(linda, Y).

Exercise 4 queries:
1a. brother_in_law(bob, Y).
1b. brother_in_law(michael, Y).
1c. brother_in_law(mark, Y).
1d. brother_in_law(X, bob).
1e. brother_in_law(X, michael).
1f. brother_in_law(X, mark).
1g. sister_in_law(alice, Y).
1h. sister_in_law(sarah, Y).
1i. sister_in_law(chloe, Y).
1j. sister_in_law(X, alice).
1k. sister_in_law(X, sarah).
1l. sister_in_law(X, chloe).
2a. nth_ancestor(1, X, michael).
2b. nth_ancestor(1, michael, Y).
2c. nth_ancestor(2, X, amy).
2d. nth_ancestor(2, sarah, Y).
3a. common_ancestor(jake, nancy, Z).
3b. common_ancestor(john, lisa, Z).
3c. common_ancestor(peter, nancy, Z).
3d. common_ancestor(peter, emma, Z).
4a. common_ancestors(jake, nancy, L).
4b. common_ancestors(jake, amy, L).
4c. common_ancestors(john, lisa, L).
4d. common_ancestors(peter, tom, L).
4e. common_ancestors(peter, amy, L).