Yeah, to be fair, a couple of months ago I was eating in a restaurant and a couple with a child came and sat at the table next to mine and the child (6-8 years old?) proceeded to start watching something on a tablet with lots of loud shooting. (I mean, is that really appropriate for such a young child anyway?!? But I digress.)
The server came to check if my food was okay, I said it was, but I asked them to ask the family on the next table to turn down the volume, because I didn't think it was my place to. The staff did fuck all.
I ended up going over and politely saying that the boy's tablet was really loud and would they mind turning it down, which they did.
But really, wtf; if they think their child won't be able to behave for an hour or so in a restaurant without inflicting noisy 'shoot 'em up' soundtracks on fellow diners, then maybe they ought not to be taking their kid to a restaurant, or they ought to be training their kid to behave in public.