Not the ones who cater to narcissistic parents who got persuaded to favor predators over their own children, though?

"Big Sisters Provide A Huge Benefit To Younger Siblings, Study Finds" : Goats and Soda : NPR

https://www.npr.org/sections/goatsandsoda/2020/12/17/947566797/the-secret-to-success-having-a-big-sister