diff --git a/public/testdata/ceutrio.ped b/public/testdata/ceutrio.ped
new file mode 100644
index 000000000..1302e1a2d
--- /dev/null
+++ b/public/testdata/ceutrio.ped
@@ -0,0 +1,3 @@
+fam1 kid dad mom 1 2
+fam1 dad 0   0   1 1
+fam1 mom 0   0   2 2