$page->parentModel()
Returns the parent model, which can either be another Page or the Site
$page->parentModel(): Kirby\Cms\Page|Kirby\Cms\SiteReturn types
Kirby\Cms\PageorKirby\Cms\Site
Returns the parent model, which can either be another Page or the Site
$page->parentModel(): Kirby\Cms\Page|Kirby\Cms\SiteKirby\Cms\PageorKirby\Cms\Site