Add actions, filters, hooks, and scripts

filters.php

@@ -0,0 +1,16 @@
+<?php
+function sp_thumbnail_html( $html, $post_id, $post_thumbnail_id, $size, $attr ) {
+    if( empty ( $html ) && in_array( get_post_type( $post_id ), array( 'sp_team', 'sp_tournament', 'sp_venue' ) ) ) {
+		$parents = get_post_ancestors( $post_id );
+		foreach ( $parents as $parent ) {
+			if( has_post_thumbnail( $parent ) ) {
+				$html = get_the_post_thumbnail( $parent, $size, $attr );
+				break;
+			}
+		}
+    }
+    return $html;
+}
+
+add_filter( 'post_thumbnail_html', 'sp_thumbnail_html', 10, 5 );
+?>