TODO-2 completed, can remove a subbook from parent

templates/book.html

@@ -303,7 +303,8 @@ function AddAuthorToBook(num) {
 				</form>
 			{% else %}
 				<form role="form" class="form col-lg-10" action="{{url_for('remove_sub_book')}}" method="POST">
-					<input type="hidden" name="rem_sub_parent_id" value="{{books.id}}">
+					<input type="hidden" name="rem_sub_sub_book_id" value="{{books.id}}">
+					<input type="hidden" name="rem_sub_parent_id" value="{{b.parent[0].id}}">
 					{{ book_form.rem_sub( class="btn btn-outline-danger offset-lg-2 col-lg-3" )}}
 				</form>
 			{% endif %}