Hi triggeru571,
Types function types_child_posts($post_type, $args),
The second parameter is an array, so you can query only one post_type one time:
http://wp-types.com/documentation/user-guides/display-fields-table-content-using-views-or-the-types-api/
http://wp-types.com/documentation/user-guides/querying-and-displaying-child-posts/
If you need query more than one post_type, please try WP function get_posts():
http://codex.wordpress.org/Function_Reference/get_posts
