diff --git a/src/js/extendedFamilyModeJS.js b/src/js/extendedFamilyModeJS.js
index df8e592f1b716ff84ec517fb8c38c716b4919986..e3cce5ea9c61362a12e117d3831da200faa358fa 100644
--- a/src/js/extendedFamilyModeJS.js
+++ b/src/js/extendedFamilyModeJS.js
@@ -306,7 +306,7 @@ window.relativeTerm = /** @param {App.Entity.SlaveState} slave1 @param {App.Enti
 	} else if (slave1.father === slave2.ID) {
 		return "father";
 	} else if (areSisters(slave2, slave1) === 1) {
-		return "twin sister";
+		return "twin";
 	} else if (areSisters(slave2, slave1) === 2) {
 		return "sister";
 	} else if (areSisters(slave2, slave1) === 3) {