tax
$tax_query = array( array( 'taxonomy' => 'category', 'terms' => '12', 'field' => 'term_id', 'operator' => 'IN', 'include_children' => false, ), );
$tax_query = array( array( 'taxonomy' => 'category', 'terms' => '12', 'field' => 'term_id', 'operator' => 'IN', 'include_children' => false, ), );