is_category() if else statement

hi, im noobs in programming and i have a problem in categories

i have a lot of categories, but category = 16 or freebies have subcategories. if you call the category 16 and its subcategory it will change the navigation of the page.

here’s my current code

<?php	if ( is_category('16') || is_category(array( '15', '11', '13', '10', '12', '14' )) ) {
?>

<ul>
<li>sub category of 16</li>
<li>sub category of 16</li>
<li>sub category of 16</li>
</ul>
<?php	} else { ?>

<ul>
<li>all categories except freebies and its subcategory</li>
<li>all categories except freebies and its subcategory</li>
<li>all categories except freebies and its subcategory</li>
</ul>
<?php }?>

This code works fine for me in this URL
1. example/category/freebies/
2. example/category/freebies/subcategory

NOW WORK in this URL
1. example/freebies/subcategory/post-title/
2. example/category/freebies/page/2/

i know there’s missing in my if else statement and i dunno if the problem is in the child or parent something…

sorry in my poor english.