Laravel on delete objects call model event - deleted

Im trying to call model event - deleted. When Im deleting a video, I also want delete all comments which are associated with video, that is working fine. But I have also feeds table and when Im deleting video I want also delete all comments and comments feeds. The question is how I can make it possible to delete also comments feeds when Im deleting video?

Code in my github.com readme.md

https://github.com/Lightins/delete-feeds/blob/master/README.md

via Chebli Mohamed