I definitely think it's a 'nono' once you put that on the internet its there for life! People don't think of that though. they just think people will see what a wonderful family they look like and want to enroll.

Shoot, if I'm sending a picture to a parent (of something cute their kid was doing in daycare or what not), I'll ask permission from all parents of any other child in the picture if it's all right that it's sent.