Get blank page with child theme

Hi there
I created a child theme from the fifteen theme. Until then, no problem.
But there is an issue with a file from the parent theme:
template-tags.php is called from the file functions.php (from the parent theme).
require get_template_directory() . '/inc/template-tags.php';
But if I don’t comment this line I get a blank page (in admin also)
Can I bypass this call to this file from the child theme, that way I won’t loose the commented line at each update of Fifteen theme
Thank you
Fred