Little kids are always being underestimated, especially when it comes to horror. Quality movies for all ages that could legitimately be called horror films are more elusive than unicorns. Like I've said before, it's occasionally because simple-minded adults believe that children have enough fears and suffering to deal with, but in the case of movies, it's mostly because "all-ages horror" translates into "crap" 99% of the time. Are there any scary movies the whole family can enjoy? That's a rhetorical question, don't shout the answer at your screen.