diff --git a/assets/styles/app.css b/assets/styles/app.css
index f5b2825..6751a2a 100644
--- a/assets/styles/app.css
+++ b/assets/styles/app.css
@@ -23,3 +23,69 @@ main.app-main {
 table.dataTable {
     width: 100% !important;
 }
+
+/* --- Family tree --------------------------------------------------------- */
+.family-tree,
+.family-tree ul {
+    list-style: none;
+    margin: 0;
+    padding-left: 1.25rem;
+}
+.family-tree {
+    padding-left: 0;
+}
+.family-tree li {
+    position: relative;
+    padding: 0.15rem 0 0.15rem 1rem;
+}
+.family-tree ul > li::before {      /* elbow connector */
+    content: "";
+    position: absolute;
+    top: 0;
+    left: 0;
+    bottom: 50%;
+    width: 0.75rem;
+    border-left: 1px solid var(--bs-border-color);
+    border-bottom: 1px solid var(--bs-border-color);
+}
+.family-tree ul > li::after {       /* line continuing to siblings below */
+    content: "";
+    position: absolute;
+    top: 0;
+    left: 0;
+    height: 100%;
+    border-left: 1px solid var(--bs-border-color);
+}
+.family-tree ul > li:last-child::after {
+    display: none;
+}
+.ft-couple {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.4rem;
+    flex-wrap: wrap;
+}
+.ft-person {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.45rem;
+    padding: 0.2rem 0.5rem;
+    border: 1px solid var(--bs-border-color);
+    border-radius: 0.375rem;
+    text-decoration: none;
+    color: inherit;
+    background: var(--bs-body-bg);
+}
+.ft-person:hover {
+    border-color: var(--bs-primary);
+}
+.ft-name {
+    font-weight: 500;
+}
+.ft-meta {
+    font-size: 0.8125rem;
+    color: var(--bs-secondary-color);
+}
+.ft-amp {
+    color: var(--bs-secondary-color);
+}
diff --git a/src/Controller/NpcController.php b/src/Controller/NpcController.php
index 58ce4e8..b7dc5a2 100644
--- a/src/Controller/NpcController.php
+++ b/src/Controller/NpcController.php
@@ -5,6 +5,7 @@ namespace App\Controller;
 use App\Entity\Npc;
 use App\Form\NpcGameNotesType;
 use App\Form\NpcType;
+use App\Npc\FamilyTreeBuilder;
 use App\Repository\NpcRepository;
 use Doctrine\ORM\EntityManagerInterface;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
@@ -66,6 +67,24 @@ class NpcController extends AbstractController
         ]);
     }
 
+    /**
+     * Family tree for one family name.
+     */
+    #[Route('/npcs/family/{family}', name: 'app_npc_family', requirements: ['family' => '[^/]+'], methods: ['GET'])]
+    public function family(string $family, NpcRepository $repo, FamilyTreeBuilder $trees): Response
+    {
+        $members = $repo->findBy(['family' => $family], ['name' => 'ASC']);
+        if (!$members) {
+            throw $this->createNotFoundException(sprintf('No NPCs in family "%s".', $family));
+        }
+
+        return $this->render('npc/family.html.twig', [
+            'family' => $family,
+            'count' => \count($members),
+            'roots' => $trees->build($members),
+        ]);
+    }
+
     /**
      * In-play detail page: everything read-only, plus the game-notes field.
      */
diff --git a/src/Npc/FamilyTreeBuilder.php b/src/Npc/FamilyTreeBuilder.php
new file mode 100644
index 0000000..8ee5e3d
--- /dev/null
+++ b/src/Npc/FamilyTreeBuilder.php
@@ -0,0 +1,89 @@
+<?php
+
+namespace App\Npc;
+
+use App\Entity\Npc;
+
+/**
+ * Turns a flat list of NPCs (one family) into a parent -> child tree,
+ * pairing co-parents who are both in the family into one couple node.
+ *
+ * A node is: array{npc: Npc, spouse: Npc|null, children: list<node>}
+ */
+final class FamilyTreeBuilder
+{
+    /**
+     * @param list<Npc> $members
+     *
+     * @return list<array{npc: Npc, spouse: Npc|null, children: list<array>}>
+     */
+    public function build(array $members): array
+    {
+        /** @var array<int, Npc> $byId */
+        $byId = [];
+        foreach ($members as $m) {
+            $byId[$m->getId()] = $m;
+        }
+        $inFamily = static fn (?Npc $n): bool => null !== $n && isset($byId[$n->getId()]);
+
+        // children under every in-family parent; couples via shared children
+        $childrenOf = [];
+        $spouseOf = [];
+        foreach ($members as $m) {
+            $f = $m->getFather();
+            $mo = $m->getMother();
+            foreach ([$f, $mo] as $p) {
+                if ($inFamily($p)) {
+                    $childrenOf[$p->getId()][$m->getId()] = $m;
+                }
+            }
+            if ($inFamily($f) && $inFamily($mo)) {
+                $spouseOf[$f->getId()] = $mo;
+                $spouseOf[$mo->getId()] = $f;
+            }
+        }
+
+        $done = [];   // ids emitted anywhere in the tree
+        $build = function (Npc $npc) use (&$build, $childrenOf, $spouseOf, $byId, &$done): array {
+            $done[$npc->getId()] = true;
+            $spouse = $spouseOf[$npc->getId()] ?? null;
+            if ($spouse) {
+                $done[$spouse->getId()] = true;
+            }
+
+            $kids = ($childrenOf[$npc->getId()] ?? []) + ($spouse ? ($childrenOf[$spouse->getId()] ?? []) : []);
+            uasort($kids, static fn (Npc $a, Npc $b) => ($b->getAge() ?? 0) <=> ($a->getAge() ?? 0));
+
+            $children = [];
+            foreach ($kids as $kid) {
+                if (!isset($done[$kid->getId()])) {
+                    $children[] = $build($kid);
+                }
+            }
+
+            return ['npc' => $npc, 'spouse' => $spouse, 'children' => $children];
+        };
+
+        // Elders first: members with no in-family parent, oldest first.
+        usort($members, static fn (Npc $a, Npc $b) => ($b->getAge() ?? 0) <=> ($a->getAge() ?? 0));
+
+        $roots = [];
+        foreach ($members as $m) {
+            if (isset($done[$m->getId()])) {
+                continue;
+            }
+            if ($inFamily($m->getFather()) || $inFamily($m->getMother())) {
+                continue;
+            }
+            $roots[] = $build($m);
+        }
+        // Anyone still unplaced (odd data): show as their own root.
+        foreach ($members as $m) {
+            if (!isset($done[$m->getId()])) {
+                $roots[] = $build($m);
+            }
+        }
+
+        return $roots;
+    }
+}
diff --git a/templates/npc/family.html.twig b/templates/npc/family.html.twig
new file mode 100644
index 0000000..a9474a7
--- /dev/null
+++ b/templates/npc/family.html.twig
@@ -0,0 +1,50 @@
+{% extends 'base.html.twig' %}
+
+{% block title %}{{ family }} family · NPC's · dmtools{% endblock %}
+
+{% macro person(npc, muted) %}
+    <a class="ft-person{{ muted ? ' text-body-secondary' : '' }}" href="{{ path('app_npc_show', {id: npc.id}) }}">
+        <img src="{{ asset(npc.portraitPath) }}" alt="" width="34" height="42"
+             class="rounded object-fit-cover" onerror="this.remove()">
+        <span class="ft-name">{{ npc.name }}</span>
+        <span class="ft-meta">{{ npc.age ?? '?' }}{% if npc.occupation %} · {{ npc.occupation }}{% endif %}</span>
+    </a>
+{% endmacro %}
+
+{% macro node(n) %}
+    {% import _self as tree %}
+    <li>
+        <div class="ft-couple">
+            {{ tree.person(n.npc) }}
+            {% if n.spouse %}
+                <span class="ft-amp">&amp;</span>
+                {{ tree.person(n.spouse) }}
+            {% endif %}
+        </div>
+        {% if n.children %}
+            <ul>
+                {% for c in n.children %}{{ tree.node(c) }}{% endfor %}
+            </ul>
+        {% endif %}
+    </li>
+{% endmacro %}
+
+{% import _self as tree %}
+
+{% block body %}
+    <div class="d-flex justify-content-between align-items-start mb-3">
+        <div>
+            <a href="{{ path('app_npcs') }}" class="text-decoration-none small">&larr; All NPC's</a>
+            <h1 class="h3 mb-0">The {{ family }} family</h1>
+            <span class="text-body-secondary">{{ count }} member{{ count == 1 ? '' : 's' }}</span>
+        </div>
+    </div>
+
+    <div class="card shadow-sm">
+        <div class="card-body">
+            <ul class="family-tree">
+                {% for r in roots %}{{ tree.node(r) }}{% endfor %}
+            </ul>
+        </div>
+    </div>
+{% endblock %}
diff --git a/templates/npc/show.html.twig b/templates/npc/show.html.twig
index 7bff289..88a6015 100644
--- a/templates/npc/show.html.twig
+++ b/templates/npc/show.html.twig
@@ -12,7 +12,9 @@
             <div>
                 <a href="{{ path('app_npcs') }}" class="text-decoration-none small">&larr; All NPC's</a>
                 <h1 class="h3 mb-0">{{ npc.name }}</h1>
-                <span class="text-body-secondary">{{ npc.family }}{% if npc.occupation %} · {{ npc.occupation }}{% endif %}</span>
+                <span class="text-body-secondary">
+                    <a href="{{ path('app_npc_family', {family: npc.family}) }}">{{ npc.family }}</a>{% if npc.occupation %} · {{ npc.occupation }}{% endif %}
+                </span>
             </div>
         </div>
         <a href="{{ path('app_npc_edit', {id: npc.id}) }}" class="btn btn-outline-secondary btn-sm">Edit details</a>
@@ -24,7 +26,8 @@
                 <div class="card-header">Details</div>
                 <div class="card-body">
                     <dl class="row mb-0">
-                        <dt class="col-5">Family</dt><dd class="col-7">{{ npc.family }}</dd>
+                        <dt class="col-5">Family</dt>
+                        <dd class="col-7"><a href="{{ path('app_npc_family', {family: npc.family}) }}">{{ npc.family }}</a> family tree</dd>
                         <dt class="col-5">Age</dt><dd class="col-7">{{ npc.age ?? '—' }}</dd>
                         <dt class="col-5">Race</dt><dd class="col-7">{{ npc.race.value }}</dd>
                         <dt class="col-5">Occupation</dt><dd class="col-7">{{ npc.occupation ?? '—' }}</dd>