diff --git a/cloud/firestore/firestore.default.rules b/cloud/firestore/firestore.default.rules
index 11fb8776..4058215a 100644
--- a/cloud/firestore/firestore.default.rules
+++ b/cloud/firestore/firestore.default.rules
@@ -17,10 +17,6 @@ service cloud.firestore {
       allow read, write: if false;
     }
 
-    match /event-family-tokens/{familyId} {
-      allow read, write: if false;
-    }
-
     match /public-tokens/{publicSecretToken} {
       allow get: if true;
       allow list, write: if false;
diff --git a/cloud/firestore/firestore.default.rules.spec.ts b/cloud/firestore/firestore.default.rules.spec.ts
index be53c64f..6227ab28 100644
--- a/cloud/firestore/firestore.default.rules.spec.ts
+++ b/cloud/firestore/firestore.default.rules.spec.ts
@@ -147,16 +147,6 @@ const FIREBASE_MANAGED_COLLECTIONS = [
       data: () => ({dayId: 'monday', feedbacks: []}),
       updatedData: () => ({dayId: 'tuesday', feedbacks: []})
     }]
-  }, {
-    name: '/event-family-tokens/{familyId}',
-    docInitializations: [{
-      name: 'default',
-      collection: '/event-family-tokens',
-      path: '/event-family-tokens/a-family',
-      newDocPath: '/event-family-tokens/another-family',
-      data: () => ({families: ['devoxx'], token: 'ffffffff-ffff-ffff-ffff-ffffffffffff'}),
-      updatedData: () => ({families: ['devoxx'], token: 'ffffffff-ffff-ffff-ffff-fffffffffff0'})
-    }]
   }, {
     name: '/public-tokens/{tokenId}',
     docInitializations: [{
@@ -692,18 +682,6 @@ const COLLECTIONS: CollectionDescriptor[] = [{
           get: false, update: false, createDoc: false,
         }, 'alice')
     }
-}, {
-    name: "/event-family-tokens",
-    aroundTests: (_: UserContext) => ({
-        beforeEach: [],
-        afterEach: [],
-    }),
-    tests: (userContext: UserContext) => {
-      ensureCollectionFollowAccessPermissions('/event-family-tokens/{familyId}', userContext,
-        {
-          read: false, write: false
-        })
-    }
 }, {
     name: "/public-tokens",
     aroundTests: (_: UserContext) => ({
diff --git a/cloud/functions/src/functions/firestore/firestore-utils.ts b/cloud/functions/src/functions/firestore/firestore-utils.ts
index c059af19..0f89555a 100644
--- a/cloud/functions/src/functions/firestore/firestore-utils.ts
+++ b/cloud/functions/src/functions/firestore/firestore-utils.ts
@@ -31,7 +31,7 @@ export async function getSecretTokenDoc<T>(path: string) {
 
 export async function getOrganizerSpaceByToken(
    eventId: string,
-   tokenType: 'organizerSecretToken'|'familyToken',
+   tokenType: 'organizerSecretToken',
    secretToken: string
 ) {
     const organizerSpace: ConferenceOrganizerSpace = await getSecretTokenDoc(`events/${eventId}/organizer-space`);
@@ -40,13 +40,6 @@ export async function getOrganizerSpaceByToken(
         throw new Error(`Invalid organizer token for eventId=${eventId}: ${secretToken}`);
     }
 
-    if(tokenType === 'familyToken') {
-        const familyTokenValid = await checkEventFamilyTokenIsValid(eventId, secretToken);
-        if(!familyTokenValid) {
-            throw new Error(`Invalid family token for eventId=${eventId}: ${secretToken}`);
-        }
-    }
-
     return organizerSpace;
 }
 
@@ -132,18 +125,3 @@ export async function checkEventLastUpdate(
 
     return { cachedHash, updatesDetected: true };
 }
-
-export async function checkEventFamilyTokenIsValid(eventId: string, token: string) {
-    const listableEvent = (await db.collection("events").doc(eventId).get())?.data() as ListableEvent|undefined;
-
-    if(!listableEvent || !listableEvent.eventFamily) {
-        return false;
-    }
-
-    const familyTokenSnapshots = await db.collection("event-family-tokens")
-        .where('families', 'array-contains', listableEvent.eventFamily)
-        .where("token", '==', token)
-        .get()
-
-    return !familyTokenSnapshots.empty;
-}
diff --git a/cloud/functions/src/functions/firestore/migrations/020-cleaningUnusedFirestoreDocs.ts b/cloud/functions/src/functions/firestore/migrations/020-cleaningUnusedFirestoreDocs.ts
new file mode 100644
index 00000000..54533992
--- /dev/null
+++ b/cloud/functions/src/functions/firestore/migrations/020-cleaningUnusedFirestoreDocs.ts
@@ -0,0 +1,13 @@
+import {db} from "../../../firebase";
+
+
+export async function cleaningUnusedFirestoreDocs(): Promise<"OK"|"Error"> {
+  const eventFamilyTokensColl = await db.collection(`event-family-tokens`).get()
+  if(!eventFamilyTokensColl.empty) {
+    await Promise.all(eventFamilyTokensColl.docs.map(async eventFamilyToken => {
+      return eventFamilyToken.ref.delete()
+    }))
+  }
+
+  return "OK"
+}
diff --git a/cloud/functions/src/functions/http/event/legacy/deprecatedAttendeesFeedbacks.ts b/cloud/functions/src/functions/http/event/legacy/deprecatedAttendeesFeedbacks.ts
index d507eb6f..677793f2 100644
--- a/cloud/functions/src/functions/http/event/legacy/deprecatedAttendeesFeedbacks.ts
+++ b/cloud/functions/src/functions/http/event/legacy/deprecatedAttendeesFeedbacks.ts
@@ -18,14 +18,12 @@ export async function legacyAttendeesFeedbacks(request: functions.https.Request,
 
     const organizerSecretToken = extractSingleQueryParam(request, 'organizerSecretToken');
     const talkIds = extractMultiQueryParam(request, 'talkIds');
-    // deprecated
-    const familyToken = extractSingleQueryParam(request, 'familyToken');
     const familyOrganizerSecretToken = extractSingleQueryParam(request, 'familyOrganizerSecretToken');
     const eventId = extractSingleQueryParam(request, 'eventId');
 
     if(!talkIds || !talkIds.length) { return sendResponseMessage(response, 400, `Missing [talkIds] (multi) query parameter !`) }
     if(!eventId) { return sendResponseMessage(response, 400, `Missing [eventId] query parameter !`) }
-    if(!organizerSecretToken && !familyToken && !familyOrganizerSecretToken) { return sendResponseMessage(response, 400, `Missing either [organizerSecretToken] or [familyToken] or [familyOrganizerSecretToken] query parameter !`) }
+    if(!organizerSecretToken && !familyOrganizerSecretToken) { return sendResponseMessage(response, 400, `Missing either [organizerSecretToken] or [familyOrganizerSecretToken] query parameter !`) }
 
     const eventDescriptor = await getEventDescriptor(eventId);
     if(familyOrganizerSecretToken) {
@@ -48,13 +46,11 @@ export async function legacyAttendeesFeedbacks(request: functions.https.Request,
     // }
 
     try {
-        const organizerSpace = await match([organizerSecretToken, familyToken, familyOrganizerSecretToken])
-            .with([ P.nullish, P.nullish, P.nullish ], async ([_1, _2]) => { throw new Error(`Unexpected state: (undefined,undefined)`); })
-            .with([ P.not(P.nullish), P.any, P.any ], async ([organizerSecretToken, _]) => {
+        const organizerSpace = await match([organizerSecretToken, familyOrganizerSecretToken])
+            .with([ P.nullish, P.nullish ], async ([_1, _2]) => { throw new Error(`Unexpected state: (undefined,undefined)`); })
+            .with([ P.not(P.nullish), P.any ], async ([organizerSecretToken, _]) => {
                 return getOrganizerSpaceByToken(eventId, 'organizerSecretToken', organizerSecretToken);
-            }).with([ P.any, P.not(P.nullish), P.any ], async ([_, familyToken]) => {
-                return getOrganizerSpaceByToken(eventId, 'familyToken', familyToken);
-            }).with([ P.any, P.any, P.not(P.nullish) ], async ([_1, _2, familyOrganizerSecretToken]) => {
+            }).with([ P.any, P.not(P.nullish) ], async ([_1]) => {
                 return getSecretTokenDoc<ConferenceOrganizerSpace>(`/events/${eventId}/organizer-space`);
             }).run()
 
diff --git a/cloud/functions/src/functions/http/event/legacy/deprecatedEventStats.ts b/cloud/functions/src/functions/http/event/legacy/deprecatedEventStats.ts
index 17ea8ea4..e60451ea 100644
--- a/cloud/functions/src/functions/http/event/legacy/deprecatedEventStats.ts
+++ b/cloud/functions/src/functions/http/event/legacy/deprecatedEventStats.ts
@@ -12,11 +12,10 @@ import * as express from "express";
 export async function deprecatedEventStats(request: functions.https.Request, response: express.Response) {
 
     const organizerSecretToken = extractSingleQueryParam(request, 'organizerSecretToken');
-    const familyToken = extractSingleQueryParam(request, 'familyToken');
     const eventId = extractSingleQueryParam(request, 'eventId');
 
     if(!eventId) { return sendResponseMessage(response, 400, `Missing [eventId] query parameter !`) }
-    if(!organizerSecretToken && !familyToken) { return sendResponseMessage(response, 400, `Missing either [organizerSecretToken] or [familyToken] query parameter !`) }
+    if(!organizerSecretToken) { return sendResponseMessage(response, 400, `Missing either [organizerSecretToken] or [familyToken] query parameter !`) }
 
     const { cachedHash, updatesDetected } = await checkEventLastUpdate(eventId, [
         root => root.favorites,
@@ -27,12 +26,10 @@ export async function deprecatedEventStats(request: functions.https.Request, res
     }
 
     try {
-        const organizerSpace = await match([organizerSecretToken, familyToken])
-            .with([ P.nullish, P.nullish ], async ([_1, _2]) => { throw new Error(`Unexpected state: (undefined,undefined)`); })
-            .with([ P.not(P.nullish), P.any ], async ([organizerSecretToken, _]) => {
+        const organizerSpace = await match([organizerSecretToken])
+            .with([ P.nullish ], async ([_1]) => { throw new Error(`Unexpected state: (undefined,undefined)`); })
+            .with([ P.not(P.nullish) ], async ([organizerSecretToken]) => {
                 return getOrganizerSpaceByToken(eventId, 'organizerSecretToken', organizerSecretToken);
-            }).with([ P.any, P.not(P.nullish) ], async ([_, familyToken]) => {
-                return getOrganizerSpaceByToken(eventId, 'familyToken', familyToken);
             }).run()
 
         const talksStats = await eventTalkStatsFor(eventId);
diff --git a/cloud/functions/src/functions/http/migrateFirestoreSchema.ts b/cloud/functions/src/functions/http/migrateFirestoreSchema.ts
index be655be5..ccf15b12 100644
--- a/cloud/functions/src/functions/http/migrateFirestoreSchema.ts
+++ b/cloud/functions/src/functions/http/migrateFirestoreSchema.ts
@@ -28,6 +28,7 @@ const MIGRATIONS: Migration[] = [
     { name: "migrateFamilyEventsStatsAccessTokenTypes", exec: async () => (await import("../firestore/migrations/017-migrateSomePublicTokenTypes")).migrateFamilyEventsStatsAccessTokenTypes() },
     { name: "introduceTalkAssets", exec: async () => (await import("../firestore/migrations/018-introduceTalkAssets")).introduceTalkAssets() },
     { name: "introduceFormattingsFeature", exec: async () => (await import("../firestore/migrations/019-introduceFormattingsFeature")).introduceFormattingsFeature() },
+    { name: "cleaningUnusedFirestoreDocs", exec: async () => (await import("../firestore/migrations/020-cleaningUnusedFirestoreDocs")).cleaningUnusedFirestoreDocs() },
 ];
 
 export type MigrationResult = "OK"|"Error";