Molakai, I don’t know how old MIL is, but if she has time to look after a child during a working week, I’m assuming retired (or near retirement age), so I was giving her that age group. I don’t know about anyone else’s parents, but my parents have friends younger and older than them, that they have known for years, so they go to lots of funerals.
You missed the point with regard to communication, it’s not the possibility that it is free as to why she does not think it’s a big deal enough to communicate (that’s the reason, if they don’t like her position, they should seek alternative care), it’s that she is not a professional carer she is his grandmother and their ‘family’, it takes a village and all that. The idea she needs to ask permission to take him anywhere would not occur to her. So since they have a problem it, it needed to occur to them.
Btw, when you quote me can you use context? Culturally we do things different to how the white British do it, that’s why I find the OP’s stance so weird. I do agree with a PP though, once the OP’s DH said no, that should have been the end of it, but because these boundaries had not been established, they are where they are.
My professional carer always asked me if she could take my child with her to Next. My non professional carer (DM) just took said child to Morrisons, I never even knew, but I knew she was safe in both instances. At the same time, there was one particular place my DM was informed she could not take my child, it was a non-negotiable, my DD didn’t go there.