diff --git a/lib/selectors/user-selectors.js b/lib/selectors/user-selectors.js
--- a/lib/selectors/user-selectors.js
+++ b/lib/selectors/user-selectors.js
@@ -126,12 +126,30 @@
   return relativeMemberInfos;
 }
 
-const emptyArray: $ReadOnlyArray<LegacyRelativeMemberInfo> = [];
+function getRelativeMemberInfos(
+  threadInfo: ?MinimallyEncodedRawThreadInfo | LegacyRawThreadInfo,
+  currentUserID: ?string,
+  userInfos: UserInfos,
+): $ReadOnlyArray<
+  MinimallyEncodedRelativeMemberInfo | LegacyRelativeMemberInfo,
+> {
+  if (threadInfo?.minimallyEncoded) {
+    return getMinimallyEncodedRelativeMemberInfos(
+      threadInfo,
+      currentUserID,
+      userInfos,
+    );
+  } else {
+    return getLegacyRelativeMemberInfos(threadInfo, currentUserID, userInfos);
+  }
+}
+
+const emptyArray: $ReadOnlyArray<RelativeMemberInfo> = [];
 
 // Includes current user at the start
 const baseRelativeMemberInfoSelectorForMembersOfThread: (
   threadID: ?string,
-) => (state: BaseAppState<>) => $ReadOnlyArray<LegacyRelativeMemberInfo> = (
+) => (state: BaseAppState<>) => $ReadOnlyArray<RelativeMemberInfo> = (
   threadID: ?string,
 ) => {
   if (!threadID) {
@@ -142,7 +160,7 @@
     (state: BaseAppState<>) =>
       state.currentUserInfo && state.currentUserInfo.id,
     (state: BaseAppState<>) => state.userStore.userInfos,
-    getLegacyRelativeMemberInfos,
+    getRelativeMemberInfos,
   );
 };
 
@@ -279,6 +297,7 @@
 
 export {
   userIDsToRelativeUserInfos,
+  getRelativeMemberInfos,
   getMinimallyEncodedRelativeMemberInfos,
   getLegacyRelativeMemberInfos,
   relativeMemberInfoSelectorForMembersOfThread,