10.
“Tattling. My sister and I would constantly try to get each other in trouble because my mom would reward us for turning each other in. I don’t think we’ll ever have a normal relationship because of this.”
“I understand that tattling is OK if someone is being harmful to themselves or others, but it was always over ‘small things.’ For example, I once had my electronic after bedtime, and my sister spied through the crack in my bathroom door, and she tattled to my mom. My mom’s response was to take away the electronic, my Christmas gift, and give it to my sister. I never used it again. Things like this have led to us not trusting each other at all, even as near adults.”
—katethygreat
Source: https://www.buzzfeed.com/lizmrichardson/most-toxic-siblings