Family taking pictures of my child ❌

So I have a 3 year old and due with baby number 2 in the summer. When my first was born, I never thought much of it when family used to take pictures/videos of him. But when they upload it on social media it does bother me and I have to tell them please don’t post anything of my child especially when I don’t know who out there is viewing it. I know they’ll do the same with my newborn and I’ve noticed some members in the past would wake my first child up just to take selfies and videos! How do I stop this even when I’ve said politely? I don’t want the same happening with my second and know they won’t listen. Especially when some family members are obsessed with social media these days for the likes/views. Sorry for the rant 😩