Tax Query General
$tax_query = array( 'relation' => 'AND', array( 'taxonomy' => 'category', 'terms' => array( '1', '2' ), 'field' => 'term_id', 'operator' => 'IN', 'include_children' => true, ), );
$tax_query = array( 'relation' => 'AND', array( 'taxonomy' => 'category', 'terms' => array( '1', '2' ), 'field' => 'term_id', 'operator' => 'IN', 'include_children' => true, ), );