diff --git a/src/js/slaveInteract.js b/src/js/slaveInteract.js
index bdb887cf37a144d1a814e0903b085fc91db6487e..8989f10b62a3796263728b1fce3d5ff2433825f7 100644
--- a/src/js/slaveInteract.js
+++ b/src/js/slaveInteract.js
@@ -642,7 +642,7 @@ App.UI.SlaveInteract.useSlaveDisplay = function(slave) {
 					let assayedSlave = getSlave(slave.relationTarget);
 					const
 					{
-						daughter: daughter2, mother: mother2
+						daughter: daughter2, mother: mother2, sister: sister2
 					} = getPronouns(assayedSlave);
 					if (isSlaveAvailable(assayedSlave)) {
 						if (slave.relation === "mother") {