error in functions.php

Hi, I’m trying to add custom function is_child to functions.php file

and I’m getting the error:
Parse error: syntax error, unexpected T_FUNCTION in /home/content/45/7069945/html/wp-content/themes/mountain-dawn/functions.php on line 8

this is my functions.php

<?php

if ( function_exists('register_sidebars') )
register_sidebars(2);

Remove_action('wp_head', 'wp_generator');

function is_child($parent) {
	global $wp_query;
	if ($wp_query->post->post_parent == $parent) {
		$return = true;
	}
	else {
		$return = false;
	}
	return $return;
}
?>

any suggestion?