diff --git a/mercurial/hgweb/webcommands.py b/mercurial/hgweb/webcommands.py
--- a/mercurial/hgweb/webcommands.py
+++ b/mercurial/hgweb/webcommands.py
@@ -639,8 +639,8 @@ def comparison(web, req, tmpl):
                 author=ctx.user(),
                 rename=rename,
                 branch=webutil.nodebranchnodefault(ctx),
-                parent=webutil.parents(ctx),
-                child=webutil.children(ctx),
+                parent=webutil.parents(fctx),
+                child=webutil.children(fctx),
                 leftrev=leftrev,
                 leftnode=hex(leftnode),
                 rightrev=rightrev,
diff --git a/tests/test-hgweb-diffs.t b/tests/test-hgweb-diffs.t
--- a/tests/test-hgweb-diffs.t
+++ b/tests/test-hgweb-diffs.t
@@ -628,7 +628,7 @@ comparison new file
   </tr>
   <tr>
    <th>children</th>
-   <td><a href="/file/559edbd9ed20/a">559edbd9ed20</a> </td>
+   <td></td>
   </tr>
   
   </table>
@@ -746,7 +746,7 @@ comparison existing file
   </tr>
   <tr>
    <th>parents</th>
-   <td><a href="/file/559edbd9ed20/a">559edbd9ed20</a> </td>
+   <td><a href="/file/0cd96de13884/a">0cd96de13884</a> </td>
   </tr>
   <tr>
    <th>children</th>
@@ -870,7 +870,7 @@ comparison removed file
   </tr>
   <tr>
    <th>parents</th>
-   <td><a href="/file/d73db4d812ff/a">d73db4d812ff</a> </td>
+   <td><a href="/file/0cd96de13884/a">0cd96de13884</a> </td>
   </tr>
   <tr>
    <th>children</th>