Wait since when is death to grown up for children? Or it seems to me like some of you are making that argument. And what the hell are children? 1-5?5-10?5-12?
Believe me kids around 10 barely note death of side characters as a thing anymore, and when major characters meet their deaths well they should mean something damn it! That's what made Lion King, Tarzan, The Land Before Time and others stand out to me and other kids...
Today children are more informed and arguably grow up faster(in some regards), I really don't see why would they have any problems with much of the shows named in the previous posts except GoT. So what if storm troopers die? I don't really see how does this affect children in any way, the ones who don't understand what death is don't pay attention and the ones who do are also most likely to ignore it, because WHO THE CARES ABOUT THE MINDLESS STORM TROOPERS ???
Me, my brother and all of our friends watched a lot of movies that are pg-13 or R-Rated before the appropriate age, yet nothings is or has been wrong with us.
I personally would trust my own child to determine when is it to gruesome to watch, I just don't see a better parameter. As a kid I had a pretty good Idea what I want to see and what I don't want to see.