2 files changed, 26 insertions, 0 deletions
diff --git a/prolog/problems/family_relations/grandparent_2/common.py b/prolog/problems/family_relations/grandparent_2/common.py
new file mode 100644
index 0000000..12b7c0d
--- /dev/null
+++ b/prolog/problems/family_relations/grandparent_2/common.py
@@ -0,0 +1,11 @@
+id = 95
+group = 'family_relations'
+number = 2
+visible = True
+facts = 'family_relations'
+
+solution = '''\
+grandparent(X, Y) :-
+  parent(X, Z),
+  parent(Z, Y).
+'''
diff --git a/prolog/problems/family_relations/grandparent_2/en.py b/prolog/problems/family_relations/grandparent_2/en.py
new file mode 100644
index 0000000..cdc9cec
--- /dev/null
+++ b/prolog/problems/family_relations/grandparent_2/en.py
@@ -0,0 +1,15 @@
+id = 95
+name = 'grandparent/2'
+slug = 'the grandparent relation'
+
+description = '''\
+<p><code>grandparent(P, C)</code>: <code>P</code> is a grandparent of <code>C</code>.</p>
+<pre>
+  ?- grandparent(tina, X).
+    X = vanessa ;
+    X = patricia.
+  ?- grandparent(tina, vanessa).
+    true.
+</pre>'''
+
+hint = {}