diff --git a/core/basethemelet.class.php b/core/basethemelet.class.php
index 9bfb1a18..de23c99b 100644
--- a/core/basethemelet.class.php
+++ b/core/basethemelet.class.php
@@ -67,7 +67,7 @@ class BaseThemelet {
 		$custom_classes = "";
 		if(class_exists("Relationships")){
 			if(property_exists($image, 'parent_id') && $image->parent_id !== NULL){	$custom_classes .= "shm-thumb-has_parent ";	}
-			if(property_exists($image, 'has_children') && $image->has_children == TRUE){ $custom_classes .= "shm-thumb-has_child "; }
+			if(property_exists($image, 'has_children') && bool_escape($image->has_children)){ $custom_classes .= "shm-thumb-has_child "; }
 		}
 
 		return "<a href='$h_view_link' class='thumb shm-thumb shm-thumb-link {$custom_classes}' data-tags='$h_tags' data-post-id='$i_id'>".
diff --git a/ext/relatationships/main.php b/ext/relatationships/main.php
index 8ecc6991..e81aefbb 100644
--- a/ext/relatationships/main.php
+++ b/ext/relatationships/main.php
@@ -21,11 +21,17 @@ class Relationships extends Extension {
 			$config->set_int("ext_relationships_version", 1);
 			log_info("relationships", "extension installed");
 		}
+		if ($config->get_int("ext_relationships_version") < 2){
+			$database->execute("CREATE INDEX images__has_children ON images(has_children)");
+
+			$config->set_int("ext_relationships_version", 2);
+			log_info("relationships", "extension updated");
+		}
 	}
 
 	public function onImageInfoSet(ImageInfoSetEvent $event) {
 		if(isset($_POST['tag_edit__tags']) ? !preg_match('/parent[=|:]/', $_POST["tag_edit__tags"]) : TRUE) { //Ignore tag_edit__parent if tags contain parent metatag
-			if (isset($_POST["tag_edit__parent"]) ? ctype_digit($_POST["tag_edit__parent"]) : FALSE) {
+			if(isset($_POST["tag_edit__parent"]) ? ctype_digit($_POST["tag_edit__parent"]) : FALSE) {
 				$this->set_parent($event->image->id, (int) $_POST["tag_edit__parent"]);
 			}else{
 				$this->remove_parent($event->image->id);
@@ -83,7 +89,7 @@ class Relationships extends Extension {
 	public function onImageDeletion(ImageDeletionEvent $event) {
 		global $database;
 
-		if($event->image->has_children){
+		if(bool_escape($event->image->has_children)){
 			$database->execute("UPDATE images SET parent_id = NULL WHERE parent_id = :iid", array("iid"=>$event->image->id));
 		}
 
diff --git a/ext/relatationships/theme.php b/ext/relatationships/theme.php
index 39018ae3..abc4302e 100644
--- a/ext/relatationships/theme.php
+++ b/ext/relatationships/theme.php
@@ -12,7 +12,7 @@ class RelationshipsTheme extends Themelet {
 			$page->add_block(new Block(null, "This post belongs to a $a.", "main", 5));
 		}
 
-		if($image->has_children == TRUE){
+		if(bool_escape($image->has_children)){
 			$ids = $database->get_col("SELECT id FROM images WHERE parent_id = :iid", array("iid"=>$image->id));
 
 			$html = "This post has <a href='".make_link('post/list/parent='.$image->id.'/1')."'>".(count($ids) > 1 ? "child posts" : "a child post")."</a>";