diff --git a/app/Form/Resources/ParticipantResource.php b/app/Form/Resources/ParticipantResource.php
index ec3f3991..b5029e62 100644
--- a/app/Form/Resources/ParticipantResource.php
+++ b/app/Form/Resources/ParticipantResource.php
@@ -29,6 +29,7 @@ class ParticipantResource extends JsonResource
             'children_count' => $this->children_count,
             'links' => [
                 'destroy' => route('participant.destroy', ['participant' => $this->getModel()]),
+                'children' => route('form.participant.index', ['form' => $this->form, 'parent' => $this->id])
             ]
         ];
     }
diff --git a/resources/js/composables/useApiIndex.js b/resources/js/composables/useApiIndex.js
index 13a64dcc..ffba4997 100644
--- a/resources/js/composables/useApiIndex.js
+++ b/resources/js/composables/useApiIndex.js
@@ -2,10 +2,12 @@ import {ref, inject, onBeforeUnmount} from 'vue';
 import {router} from '@inertiajs/vue3';
 import useQueueEvents from './useQueueEvents.js';
 
-export function useApiIndex(url, siteName) {
+export function useApiIndex(firstUrl, siteName) {
     const axios = inject('axios');
     const {startListener, stopListener} = useQueueEvents(siteName, () => reload());
     const single = ref(null);
+
+    const url = ref(firstUrl);
     const inner = {
         data: ref([]),
         meta: ref({}),
@@ -17,7 +19,7 @@ export function useApiIndex(url, siteName) {
             ...p,
         };
 
-        var response = (await axios.get(url, {params})).data;
+        var response = (await axios.get(url.value, {params})).data;
         inner.data.value = response.data;
         inner.meta.value = response.meta;
     }
@@ -72,6 +74,10 @@ export function useApiIndex(url, siteName) {
         single.value = null;
     }
 
+    function updateUrl(newUrl) {
+        url.value = newUrl;
+    }
+
     startListener();
     onBeforeUnmount(() => stopListener());
 
@@ -91,5 +97,7 @@ export function useApiIndex(url, siteName) {
         cancel,
         axios,
         toFilterString,
+        updateUrl,
+        url,
     };
 }
diff --git a/resources/js/views/form/Participants.vue b/resources/js/views/form/Participants.vue
index 6b333f6c..29d9afaa 100644
--- a/resources/js/views/form/Participants.vue
+++ b/resources/js/views/form/Participants.vue
@@ -10,6 +10,7 @@
             </div>
         </ui-popup>
         <page-filter breakpoint="lg">
+            <f-switch v-if="meta.has_nami_field" id="group_participants" v-model="groupParticipants" label="Gruppieren" size="sm" name="group_participants"></f-switch>
             <f-multipleselect id="active_columns" v-model="activeColumnsConfig" :options="meta.columns" label="Aktive Spalten" size="sm" name="active_columns"></f-multipleselect>
 
             <template v-for="(filter, index) in meta.filters">
@@ -54,15 +55,44 @@
                 <th></th>
             </thead>
 
-            <tr v-for="(participant, index) in data" :key="index">
-                <td v-for="column in activeColumns" :key="column.id">
-                    <div v-text="participant[column.display_attribute]"></div>
-                </td>
-                <td>
-                    <a v-tooltip="`Bearbeiten`" href="#" class="ml-2 inline-flex btn btn-warning btn-sm" @click.prevent="edit(participant)"><ui-sprite src="pencil"></ui-sprite></a>
-                    <a v-tooltip="`Löschen`" href="#" class="ml-2 inline-flex btn btn-danger btn-sm" @click.prevent="deleting = participant"><ui-sprite src="trash"></ui-sprite></a>
-                </td>
-            </tr>
+            <template v-for="(participant, index) in data" :key="index">
+                <tr>
+                    <td v-for="(column, columnindex) in activeColumns" :key="column.id">
+                        <ui-table-toggle-button
+                            v-if="columnindex === 0 && groupParticipants"
+                            :value="participant"
+                            :text="participant[column.display_attribute]"
+                            :level="0"
+                            :active="isOpen(participant.id)"
+                            @toggle="toggle(participant)"
+                        ></ui-table-toggle-button>
+                        <div v-else v-text="participant[column.display_attribute]"></div>
+                    </td>
+                    <td>
+                        <a v-tooltip="`Bearbeiten`" href="#" class="ml-2 inline-flex btn btn-warning btn-sm" @click.prevent="edit(participant)"><ui-sprite src="pencil"></ui-sprite></a>
+                        <a v-tooltip="`Löschen`" href="#" class="ml-2 inline-flex btn btn-danger btn-sm" @click.prevent="deleting = participant"><ui-sprite src="trash"></ui-sprite></a>
+                    </td>
+                </tr>
+                <template v-for="child in childrenOf(participant.id)" :key="child.id">
+                    <tr>
+                        <td v-for="(column, columnindex) in activeColumns" :key="column.id">
+                            <ui-table-toggle-button
+                                v-if="columnindex === 0 && groupParticipants"
+                                :value="child"
+                                :text="child[column.display_attribute]"
+                                :level="1"
+                                :active="isOpen(child.id)"
+                                @toggle="toggle(child)"
+                            ></ui-table-toggle-button>
+                            <div v-else v-text="child[column.display_attribute]"></div>
+                        </td>
+                        <td>
+                            <a v-tooltip="`Bearbeiten`" href="#" class="ml-2 inline-flex btn btn-warning btn-sm" @click.prevent="edit(child)"><ui-sprite src="pencil"></ui-sprite></a>
+                            <a v-tooltip="`Löschen`" href="#" class="ml-2 inline-flex btn btn-danger btn-sm" @click.prevent="deleting = child"><ui-sprite src="trash"></ui-sprite></a>
+                        </td>
+                    </tr>
+                </template>
+            </template>
         </table>
         <div class="px-6">
             <ui-pagination class="mt-4" :value="meta" @reload="reloadPage"></ui-pagination>
@@ -73,8 +103,10 @@
 <script setup>
 import {watch, ref, computed} from 'vue';
 import {useApiIndex} from '../../composables/useApiIndex.js';
+import useTableToggle from '../../composables/useTableToggle.js';
 
 const deleting = ref(null);
+const {isOpen, toggle, childrenOf, clearToggle} = useTableToggle({});
 
 const props = defineProps({
     url: {
@@ -92,8 +124,20 @@ const props = defineProps({
         required: true,
     },
 });
+const groupParticipants = computed({
+    get() {
+        return url.value === props.rootUrl;
+    },
+    async set(v) {
+        updateUrl(v ? props.rootUrl : props.url);
+        if (!v) {
+            clearToggle();
+        }
+        await reload();
+    },
+});
 
-var {meta, data, reload, reloadPage, axios, remove, toFilterString} = useApiIndex(props.url, 'participant');
+var {meta, data, reload, reloadPage, axios, remove, toFilterString, url, updateUrl} = useApiIndex(props.hasNamiField ? props.rootUrl : props.url, 'participant');
 
 const activeColumns = computed(() => meta.value.columns.filter((c) => meta.value.form_meta.active_columns.includes(c.id)));
 
diff --git a/tests/Feature/Form/ParticipantIndexActionTest.php b/tests/Feature/Form/ParticipantIndexActionTest.php
index 07d1710c..77133ec1 100644
--- a/tests/Feature/Form/ParticipantIndexActionTest.php
+++ b/tests/Feature/Form/ParticipantIndexActionTest.php
@@ -197,6 +197,7 @@ class ParticipantIndexActionTest extends FormTestCase
         $this->callFilter('form.participant.index', [], ['form' => $form, 'parent' => -1])
             ->assertJsonPath('data.0.children_count', 2)
             ->assertJsonPath('data.1.children_count', 0)
+            ->assertJsonPath('data.0.links.children', route('form.participant.index', ['form' => $form, 'parent' => $participant->id]))
             ->assertJsonPath('meta.current_page', 1);
         $this->callFilter('form.participant.index', [], ['form' => $form, 'parent' => $participant->id])->assertJsonPath('data.0.children_count', 0);
     }