% Load the program
[sibling].

% Query 1:  test that the parent relation works.  Because I tested it
% first, I know this produces two answers, so I'll put two ; after the
% query.  If Prolog says yes rather than no in the .out file, I'll know
% that something went wrong, since that would mean there are more than 2
% answers.
parent(X,alice).
;
;

% Query 2: test sibling.  Because I tested it first, I know this produces
% four answers, so I'll put four ; after the query.
sibling(A,alice).
;
;
;
;