Hiding Parent Theme

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There is a filter called wp_prepare_themes_for_js in wp-admin/includes/theme.php in the wp_prepare_themes_for_js() function, which is called by wp-admin/themes.php to populate the theme set. That filter will allow you to remove themes from the list. Of course, you have to know the theme name.

function kill_theme_wpse_188906($themes) {
  unset($themes['twentyten']);
  return $themes;
}
add_filter('wp_prepare_themes_for_js','kill_theme_wpse_188906');

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