Ok I'm willing to be told I'm BU. My dh and I have two boys, 3 and 5. My dhs younger sister (who is lovely) is very close to them and comes over to ours maybe a few times a month to see them and sometimes to babysit for us.
I get on really well with SIL, I have no complaints about her other wise, but every time she comes to ours she takes out her phone and snaps loads of pictures of my DSs. Every single time.
It is starting to annoy me a bit tbh. I know she isn't going to do anything sinister with them, I'm not suggesting that. She also doesn't have twitter/fb or anything so she's not going to display them there. I actually don't know what she does with them, puts them on her laptop I guess.
But she just takes so many of them. I find it a bit strange. Dh doesn't think anything of it and just says it's because she's so close to them and loves them, which I don't doubt, but she just takes her phone out and snaps and snaps and snaps like there's no tomorrow. It's not as if she never sees them 
Wibu to tel her to stop taking so much? Or at least ask her what the heck she does with them all?