IOs6 how to remove embarrassing photo on photo stream?

So I took a few photos I don't want the rest of my family seeing and they where uploaded to photo stream. I have iOS6.1 and i don't know what the rest of my family have of their iPhones, but they have iOS 5 or higher. I turned off photo stream right after and it said that it was deleting the photos. I stored them on an app before deleting the photos as well before turning off photo stream.

How can I remove the photos off photo stream if they already haven't been removed?

There has to be a delete option