diff --git a/geneit_app/src/api/FamilyApi.ts b/geneit_app/src/api/FamilyApi.ts
index a79e99e..0b6e5d2 100644
--- a/geneit_app/src/api/FamilyApi.ts
+++ b/geneit_app/src/api/FamilyApi.ts
@@ -2,6 +2,14 @@ import { APIClient } from "./ApiClient";
 
 export interface Family {}
 
+export enum JoinFamilyResult {
+  TooManyRequests,
+  InvalidCode,
+  AlreadyMember,
+  Error,
+  Success,
+}
+
 export class FamilyApi {
   /**
    * Create a new family
@@ -13,4 +21,29 @@ export class FamilyApi {
       jsonData: { name: name },
     });
   }
+
+  /**
+   * Join an existing family
+   */
+  static async JoinFamily(code: string): Promise<JoinFamilyResult> {
+    const res = await APIClient.exec({
+      method: "POST",
+      uri: "/family/join",
+      allowFail: true,
+      jsonData: { code: code },
+    });
+
+    if (res.status >= 200 && res.status < 300) return JoinFamilyResult.Success;
+
+    switch (res.status) {
+      case 429:
+        return JoinFamilyResult.TooManyRequests;
+      case 404:
+        return JoinFamilyResult.InvalidCode;
+      case 409:
+        return JoinFamilyResult.AlreadyMember;
+      default:
+        return JoinFamilyResult.Error;
+    }
+  }
 }
diff --git a/geneit_app/src/api/ServerApi.ts b/geneit_app/src/api/ServerApi.ts
index 274dcc5..129f008 100644
--- a/geneit_app/src/api/ServerApi.ts
+++ b/geneit_app/src/api/ServerApi.ts
@@ -10,6 +10,7 @@ interface Constraints {
   user_name_len: LenConstraint;
   password_len: LenConstraint;
   family_name_len: LenConstraint;
+  invitation_code_len: LenConstraint;
 }
 
 interface OIDCProvider {
diff --git a/geneit_app/src/dialogs/CreateFamilyDialog.tsx b/geneit_app/src/dialogs/CreateFamilyDialog.tsx
index 6f66fa2..bd6eb44 100644
--- a/geneit_app/src/dialogs/CreateFamilyDialog.tsx
+++ b/geneit_app/src/dialogs/CreateFamilyDialog.tsx
@@ -39,7 +39,7 @@ export function CreateFamilyDialog(p: {
   return (
     <TextInputDialog
       open={p.open}
-      title="Creation d'une famille"
+      title="Création d'une famille"
       text="Veuillez définir le nom que vous souhaitez donner à la famille créée :"
       label="Nom de la famille"
       minLen={ServerApi.Config.constraints.family_name_len.min}
diff --git a/geneit_app/src/dialogs/JoinFamilyDialog.tsx b/geneit_app/src/dialogs/JoinFamilyDialog.tsx
new file mode 100644
index 0000000..4f95dff
--- /dev/null
+++ b/geneit_app/src/dialogs/JoinFamilyDialog.tsx
@@ -0,0 +1,81 @@
+import React from "react";
+import { TextInputDialog } from "./TextInputDialog";
+import { ServerApi } from "../api/ServerApi";
+import { FamilyApi, JoinFamilyResult } from "../api/FamilyApi";
+import { useAlert } from "../widgets/AlertDialogProvider";
+
+export function JoinFamilyDialog(p: {
+  open: boolean;
+  onClose: () => void;
+  onJoined: () => void;
+}): React.ReactElement {
+  const [code, setCode] = React.useState("");
+  const [joining, setJoining] = React.useState(false);
+  const [error, setError] = React.useState<string>();
+
+  const alert = useAlert();
+
+  const cancel = () => {
+    setCode("");
+    setJoining(false);
+    setError(undefined);
+    p.onClose();
+  };
+
+  const joinFamily = async () => {
+    setJoining(true);
+    setError(undefined);
+    try {
+      const res = await FamilyApi.JoinFamily(code);
+
+      switch (res) {
+        case JoinFamilyResult.Success:
+          setCode("");
+          p.onJoined();
+          await alert.alert("La famille a été rejointe avec succès !");
+          break;
+
+        case JoinFamilyResult.TooManyRequests:
+          setError("Trop de tentatives, veuillez réessayer ultérieurement...");
+          break;
+
+        case JoinFamilyResult.InvalidCode:
+          setError("Le code spécifié est invalide !");
+          break;
+
+        case JoinFamilyResult.AlreadyMember:
+          setError("Vous êtes déjà membre de cette famille !");
+          break;
+
+        case JoinFamilyResult.Error:
+          setError("Erreur lors de la tentative de jonction à la famille !");
+          break;
+      }
+    } catch (e) {
+      console.error(e);
+      setError("Echec de l'appel au serveur !");
+    }
+    setJoining(false);
+  };
+
+  return (
+    <TextInputDialog
+      open={p.open}
+      title="Rejoindre une famille"
+      text="Veuillez spécifier le code d'invitation de la famille :"
+      label="Code de la famille"
+      minLen={ServerApi.Config.constraints.invitation_code_len.min}
+      maxLen={ServerApi.Config.constraints.invitation_code_len.max}
+      onClose={cancel}
+      onCancel={cancel}
+      submitButton="Rejoindre la famille"
+      value={code}
+      onValueChange={setCode}
+      isChecking={joining}
+      checkingMessage="Jointure en cours..."
+      errorIsBlocking={false}
+      error={error}
+      onSubmit={joinFamily}
+    />
+  );
+}
diff --git a/geneit_app/src/routes/FamiliesListRoute.tsx b/geneit_app/src/routes/FamiliesListRoute.tsx
index 772dd6f..721221b 100644
--- a/geneit_app/src/routes/FamiliesListRoute.tsx
+++ b/geneit_app/src/routes/FamiliesListRoute.tsx
@@ -3,6 +3,7 @@ import { AsyncWidget } from "../widgets/AsyncWidget";
 import { Family } from "../api/FamilyApi";
 import { Button, Typography } from "@mui/material";
 import { CreateFamilyDialog } from "../dialogs/CreateFamilyDialog";
+import { JoinFamilyDialog } from "../dialogs/JoinFamilyDialog";
 
 export function FamiliesListRoute(): React.ReactElement {
   const loadKey = React.useRef(1);
@@ -10,6 +11,7 @@ export function FamiliesListRoute(): React.ReactElement {
   const [families, setFamilies] = React.useState<Family[] | null>(null);
 
   const [createFamily, setCreateFamily] = React.useState(false);
+  const [joinFamily, setJoinFamily] = React.useState(false);
 
   const load = async () => {
     // TODO : implement
@@ -24,6 +26,10 @@ export function FamiliesListRoute(): React.ReactElement {
     setCreateFamily(true);
   };
 
+  const onRequestJoinFamily = async () => {
+    setJoinFamily(true);
+  };
+
   return (
     <AsyncWidget
       loadKey={loadKey.current}
@@ -32,7 +38,10 @@ export function FamiliesListRoute(): React.ReactElement {
       build={() => (
         <>
           {families!!.length === 0 ? (
-            <NoFamilyWidget onRequestCreateFamily={onRequestCreateFamily} />
+            <NoFamilyWidget
+              onRequestCreateFamily={onRequestCreateFamily}
+              onRequestJoinFamily={onRequestJoinFamily}
+            />
           ) : (
             <HasFamilysWidget onReload={reload} families={families!} />
           )}
@@ -46,6 +55,16 @@ export function FamiliesListRoute(): React.ReactElement {
               reload();
             }}
           />
+
+          {/** Join family dialog anchor */}
+          <JoinFamilyDialog
+            open={joinFamily}
+            onClose={() => setJoinFamily(false)}
+            onJoined={() => {
+              setJoinFamily(false);
+              reload();
+            }}
+          />
         </>
       )}
     />
@@ -54,6 +73,7 @@ export function FamiliesListRoute(): React.ReactElement {
 
 function NoFamilyWidget(p: {
   onRequestCreateFamily: () => void;
+  onRequestJoinFamily: () => void;
 }): React.ReactElement {
   return (
     <div style={{ flex: 1, display: "flex", alignItems: "center" }}>
@@ -74,7 +94,10 @@ function NoFamilyWidget(p: {
           onClick={p.onRequestCreateFamily}
         />
 
-        <NoFamilyButton label="Rejoindre une famille" onClick={() => {}} />
+        <NoFamilyButton
+          label="Rejoindre une famille"
+          onClick={p.onRequestJoinFamily}
+        />
       </div>
     </div>
   );
diff --git a/geneit_backend/src/constants.rs b/geneit_backend/src/constants.rs
index 82b736f..8429909 100644
--- a/geneit_backend/src/constants.rs
+++ b/geneit_backend/src/constants.rs
@@ -23,6 +23,7 @@ pub struct StaticConstraints {
     pub user_name_len: SizeConstraint,
     pub password_len: SizeConstraint,
     pub family_name_len: SizeConstraint,
+    pub invitation_code_len: SizeConstraint,
 }
 
 impl Default for StaticConstraints {
@@ -32,6 +33,10 @@ impl Default for StaticConstraints {
             user_name_len: SizeConstraint::new(3, 30),
             password_len: SizeConstraint::new(8, 255),
             family_name_len: SizeConstraint::new(3, 30),
+            invitation_code_len: SizeConstraint::new(
+                FAMILY_INVITATION_CODE_LEN,
+                FAMILY_INVITATION_CODE_LEN,
+            ),
         }
     }
 }