As for a 4 yr old seeing Brave. I think an 8 yr old would have no problems. A 4 yr old it depends. I know when we were kids and saw the animated Snow White, I was about 5 and had no problems but my 3 yr old brother had nightmares when the Queen turned into the Old Hag. I guess it depends on how mature your kid it. There is an opening scene where the bear attacks the father during a family picnic and later in the tower that would be the scariest for a little kid. Has your daughter seen the trailer? If she is OK with that, then that might be how you measure her reaction.