component only in child pages

[Timbow]

...Or generally, when the same rules apply to all child pages on entire template, you can see whether page has parent then show your component:

Code:

if(!empty(get_parent(false))) {
    // show component ...
}

It's that last one I need, thanks but it is giving me -
Fatal error: Can't use function return value in write context in /var/sites...



Just to be clear I have 

PHP Code:

<?php if(!empty(get_parent(false))) { get_component('tagline')}; ?>