Not a great relationship with my in-laws so am prepared to be told I'm being precious.
MIL asks for photos of DC every day, I send some a few times a week but not every day as I just can't be bothered I send them if I get a particularly nice one.
Whenever PIL come over to see DC which is about 2-3 times a week so quite a lot they wait until I nip out to the kitchen or bathroom and then snap snap snap away taking photos of DC. It happened today, I came back in and MIL was putting away her phone as if it was a secret and I said "oh have you got any nice photos?" And she said "I think so" and just put her phone away.
I've never stopped her taking photos of my children but still think even though she is their grandmother she should ask me or do it in front of me or DH so if we had an issue we could voice it. It feels like another way of her exerting control (am I going mad thinking this?) just feels disrespectful to me as it's not the odd time it's every single time. She will also never share the photos with me.