@laravelum it is in the same namespace (see the attachment) and he is using the Intelephense already.
@andyandy weird indeed, hinting a parent class from the same namespace seems to be pretty basic stuff and not working in only one project... have you possibly changed a namespace? or moved the files elsewhere by accident?
do you use https://github.com/barryvdh/laravel-ide-helper on top of the PHP Intelephense?
turning off and on again? clearing caches? re-running composer-dump autoload? re-installing the PHP Intelephense?