diff --git a/templates/books_for_series.html b/templates/books_for_series.html
index c94f8ad..12905fb 100644
--- a/templates/books_for_series.html
+++ b/templates/books_for_series.html
@@ -6,7 +6,7 @@
 		{% for book in books %}
 		<tr>
 			<td id="{{book.id}}">
-				{% if book.parent_ref|length %}
+				{% if book.parent|length %}
 					{% set style="style=visibility:hidden" %}
 				{% endif %}
 				<button name="move_button" value="up-{{book.id}}" id="up-{{book.id}}" class="btn btn-outline-primary btn-small" {{style}}
@@ -44,8 +44,8 @@
 				{% endif %}
 				{% if SeriesBookNum( series.id, book.id ) == 1 %}
 					<script>
-						{% if book.parent_ref|length %}
-							$('#up-{{book.parent_ref[0].book_id}}').prop("disabled", true)
+						{% if book.parent|length %}
+							$('#up-{{book.parent[0].id}}').prop("disabled", true)
 						{% else %}
 							$('#up-{{book.id}}').prop("disabled", true)
 						{% endif %}
@@ -53,8 +53,8 @@
 				{% endif %}
 				{% if SeriesBookNum( series.id, book.id ) == series.num_books %} 
 					<script>
-						{% if book.parent_ref|length %}
-							$('#down-{{book.parent_ref[0].book_id}}').prop("disabled", true)
+						{% if book.parent|length %}
+							$('#down-{{book.parent[0].id}}').prop("disabled", true)
 						{% else %}
 							$('#down-{{book.id}}').prop("disabled", true)
 						{% endif %}