Are you familiar with Hansel and Gretel?
Hansel and Gretel are a young brother and sister kidnapped by a cannibalistic witch living deep in the forest in a house constructed of cake and confectionery. The two children save their lives by outwitting her.
I don't think I was older than 5 when it's been first read to me.
One might think that one is an exception rather than the norm, so here's the beginning of another one[1] (more a ballad than a fairly tale, but no one would think it's weird if an 8 years old read it).
A king is hunting in a forest and encounters a house. He asks for water and a beautiful girl opens the door. He asks to marry her, but she says she needs to ask the step mother, who's in town at the moment.
The king returns later, asks the step mother, she offers him her own daughter, but the king orders her to bring the step daughter to the castle the next day.
The next day the step mother and her daughter take the step daughter to the forest, where they kill her, take out her eyes, and cut off her limbs.
The daughter then impersonates the step daughter and marries the king.
And so on. It ends relatively "well", with the step daughter being brought to life again, and the murderers "blinded, their limbs cut off and thrown to the wolves".
1 - https://cs.wikipedia.org/wiki/Zlat%C3%BD_kolovrat