diff --git a/src/utils/atproto-adapter.js b/src/utils/atproto-adapter.js
index 4959b766..9e79119c 100644
--- a/src/utils/atproto-adapter.js
+++ b/src/utils/atproto-adapter.js
@@ -340,6 +340,28 @@ function isPostView(value) {
   return !!(value?.uri && value?.author && value?.record);
 }
 
+function replyContextSourceForPost(feedItem, post) {
+  if (!feedItem?.reply || feedItem.post?.uri === post.uri) return feedItem;
+  const parent = feedItem.reply.parent;
+  if (
+    parent?.uri === post.uri &&
+    feedItem.reply.grandparentAuthor &&
+    post.record?.reply?.parent?.uri
+  ) {
+    return {
+      post,
+      reply: {
+        root: feedItem.reply.root,
+        parent: {
+          ...post.record.reply.parent,
+          author: feedItem.reply.grandparentAuthor,
+        },
+      },
+    };
+  }
+  return post;
+}
+
 function feedItemToStatuses(feedItem, agent) {
   const post = feedItem?.post || feedItem;
   if (feedItem?.reason?.$type === 'app.bsky.feed.defs#reasonRepost') {
@@ -354,8 +376,14 @@ function feedItemToStatuses(feedItem, agent) {
     statuses.push(postToStatus(statusSource, agent));
   };
 
-  addPost(feedItem?.reply?.root);
-  addPost(feedItem?.reply?.parent);
+  addPost(
+    feedItem?.reply?.root,
+    replyContextSourceForPost(feedItem, feedItem?.reply?.root),
+  );
+  addPost(
+    feedItem?.reply?.parent,
+    replyContextSourceForPost(feedItem, feedItem?.reply?.parent),
+  );
   addPost(post, feedItem);
   return statuses;
 }
diff --git a/tests/atproto-replies.spec.js b/tests/atproto-replies.spec.js
index ba050d0e..cbe528de 100644
--- a/tests/atproto-replies.spec.js
+++ b/tests/atproto-replies.spec.js
@@ -183,4 +183,73 @@ test.describe('ATProto reply mapping', () => {
       username: 'parent.test',
     });
   });
+
+  test('uses grandparent author for payload-hydrated middle replies', () => {
+    const grandparentUri = 'at://did:plc:grandparent/app.bsky.feed.post/root';
+    const item = feedReply({
+      post: {
+        record: {
+          $type: 'app.bsky.feed.post',
+          text: 'reply text',
+          createdAt: '2026-05-08T00:02:00.000Z',
+          reply: {
+            root: { uri: grandparentUri, cid: 'grandparent-cid' },
+            parent: { uri: parentUri, cid: 'parent-cid' },
+          },
+        },
+      },
+      reply: {
+        root: {
+          uri: grandparentUri,
+          cid: 'grandparent-cid',
+          author: {
+            did: 'did:plc:grandparent',
+            handle: 'grandparent.test',
+            displayName: 'Grandparent',
+          },
+          record: {
+            $type: 'app.bsky.feed.post',
+            text: 'grandparent text',
+            createdAt: '2026-05-08T00:00:00.000Z',
+          },
+        },
+        parent: {
+          uri: parentUri,
+          cid: 'parent-cid',
+          author: {
+            did: 'did:plc:parent',
+            handle: 'parent.test',
+            displayName: 'Parent',
+          },
+          record: {
+            $type: 'app.bsky.feed.post',
+            text: 'parent text',
+            createdAt: '2026-05-08T00:01:00.000Z',
+            reply: {
+              root: { uri: grandparentUri, cid: 'grandparent-cid' },
+              parent: { uri: grandparentUri, cid: 'grandparent-cid' },
+            },
+          },
+        },
+        grandparentAuthor: {
+          did: 'did:plc:grandparent',
+          handle: 'grandparent.test',
+          displayName: 'Grandparent',
+        },
+      },
+    });
+
+    const statuses = feedToStatuses([item]);
+
+    expect(statuses.map((status) => status.uri)).toEqual([
+      grandparentUri,
+      parentUri,
+      childUri,
+    ]);
+    expect(statuses[1]._atproto.replyParentUnavailable).toBe(false);
+    expect(statuses[1]._atproto.replyParentAccount).toMatchObject({
+      id: 'did:plc:grandparent',
+      username: 'grandparent.test',
+    });
+  });
 });