I really don't know what etiquette is, so am quite prepared to be told IABU and PFB.
I post a reasonable amount of photos of DS on Facebook for my friends and family to see. I don't have many friends on Facebook and my privacy settings mean that only my friends can see my photos.
I emailed a photo to a family member of DS, he then posted the photo on Facebook. He has 998 friends on Facebook and his privacy settings mean that anyone can see his photos.
AIBU to ask him to take it down? I'm not happy with it being on there but don't want to come across hypocritical or start a family feud. DH doesn't really see my issue with it.