diff --git a/utils/libraryBrowse.ts b/utils/libraryBrowse.ts
index 79fb23d..792e12a 100644
--- a/utils/libraryBrowse.ts
+++ b/utils/libraryBrowse.ts
@@ -184,6 +184,11 @@ export function familyRootClip(parts: LibraryClip[]): LibraryClip {
   return chronologicalParts(parts)[0] || parts[0]
 }
 
+/** Newest part in a family — keeps extended collections at the top of date sorts. */
+export function familyActivityAt(parts: Array<{ createdAt?: number }>) {
+  return parts.reduce((max, part) => Math.max(max, Number(part.createdAt) || 0), 0)
+}
+
 export function familyLongestDuration(parts: LibraryClip[]) {
   return parts.reduce((max, part) => Math.max(max, Number(part.duration) || 0), 0)
 }
@@ -413,7 +418,7 @@ export function buildLibraryEntries(opts: {
     : groupClips(clips).map(group => ({
       kind: 'clip' as const,
       key: group.key,
-      createdAt: group.head.createdAt,
+      createdAt: familyActivityAt(group.parts),
       name: collectionTitle(group),
       group
     }))
@@ -422,7 +427,7 @@ export function buildLibraryEntries(opts: {
     : groupStills(stills).map(group => ({
       kind: 'still' as const,
       key: group.key,
-      createdAt: group.head.createdAt,
+      createdAt: familyActivityAt(group.parts),
       name: stillCollectionTitle(group),
       stillGroup: group
     }))