Delete through API call on laravel

So i'm having trouble with deleting an element from database through eloquent of Laravel 5.2

My code is as followed:

public function destroy($language, $id)
{
    switch($language) {
        case 'nl':
            ActivitiesNL::destroy($id);
            echo 'Dutch activity Destroyed!! <br>';
            break;
        case 'en':
            ActivitiesEN::destroy($id);
            echo 'English activity Destroyed!! <br>';
            break;
        case 'de':
            ActivitiesDE::destroy($id);
            echo 'German activity Destroyed!! <br>';
            break;
        default :
            echo 'No activities destroyed... <br>';
            throw new BadRequestHttpException('Incorrect request!!');
    }
    echo 'My job here is done!';
}

the Destroy function deletes an activity from all 3 models.. In my database I have linked them with each other through foreign keys, so i could find the different languages much quicker for each activity..

Is that the reason that Destroy actually deletes the specified activity in all 3 tables and is there a way I can prevent that from happening?

Thanks in advance!!

via Chebli Mohamed