Parents tell long stories perhaps because they want to pass on their life experiences. They've been through a lot and feel it's important for their children to know about the past, whether it's family history, moral lessons from their own youth, or cultural traditions.
No. Scar stories might be too scary or disturbing for some kids. Young children especially might have nightmares or become overly worried. Also, some scar stories could involve personal and private aspects that parents may not want to expose to their kids at a young age.
There was a boy who, during a family gathering at a fancy restaurant, loudly announced that his dad still slept with a teddy bear. The dad turned bright red as everyone at the table started laughing. It was really embarrassing for him.
You could start by simply asking them and showing genuine interest. Maybe say something like, 'Mom/Dad, I'd love to hear about your childhood. Can you tell me some stories?'
Well, there was this one time at a restaurant. An entitled parent demanded that the chef make a special dish not on the menu for their picky child. When the waiter said it wasn't possible, the parent started making a huge scene, saying things like 'Don't you know who we are?' It was so absurd.