I'm posting my 'plan_site_family' table:
CREATE TABLE `plan_site_family` (
`id` int(11) NOT NULL auto_increment,
`plan_id` int(11) NOT NULL default '0',
`site_family_id` int(11) NOT NULL default '0',
PRIMARY KEY (`id`),
UNIQUE KEY `site_family_id_plan_id` (`site_family_id`,`plan_id`),
KEY `plan_id` (`plan_id`),
KEY `site_family_id` (`site_family_id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
INSERT INTO `plan_site_family` VALUES (1,1,1),(2,1,2),(3,1,3),(4,2,1),(5,2,2),(6,2,3),(7,3,1),(8,3,2),(9,3,3),(10,4,1),(11,4,2),(12,4,3),(
13,5,1),(14,5,2),(15,5,3),(16,6,1),(17,6,2),(18,6,3),(19,7,1),(20,7,2),(21,7,3),(22,8,1),(23,8,2),(24,8,3),(25,9,1),(26,9,2),(27,9,3),(28,
10,1),(29,10,2),(30,10,3),(31,11,1),(32,11,2),(33,11,3),(34,12,1),(35,12,2),(36,12,3),(37,13,1),(38,13,2),(39,13,3),(40,14,1),(41,14,2),(4
2,14,3),(43,15,1),(44,15,2),(45,15,3),(46,16,1),(47,16,2),(48,16,3),(49,17,1),(50,17,2),(51,17,3),(52,18,1),(53,18,2),(54,18,3),(55,19,1),
(56,19,2),(57,19,3),(58,20,1),(59,20,2),(60,20,3),(61,21,1),(62,21,2),(63,21,3),(64,22,1),(65,22,2),(66,22,3),(67,23,1),(68,23,2),(69,23,3
),(78,26,3),(77,26,2),(76,26,1);
If this is fresh installation and you do not have sites on it, it is better to re-install Sitebuilder to make sure that everything created correctly.