And people wonder why we isolate ourselves when we have a special needs child. I think we know lots of people are thinking this. That's our shallow view of life in this world now: the things that happen that are not preventable are a hindrance however people will willingly put up with bad behavior from people who are perfectly in control of their resources. As for what constitutes a normal noise: I really don't want to hear a dog that the owner can't bother to bring in bark incessantly or someone else's baby crying either but i consider that part and parcel of being a part of this thing we call humanity and living among other people. What a bitch.
That said if the grandmother is just putting him out there for hours to do as he will then it should be addressed however suggesting killing of a person in a ***** letter isn't exactly the most effective means to have a discussion on grandmas supervisory skills.