BuzzFead article quotes author of The Sibling Estrangement Journal!

https://www.yahoo.com/lifestyle/sister-testified-against-custody-trial-013102743.html

Here's part of the quote...

"Second, there are distinct risk factors for sibling estrangement. In her book, Brothers, Sisters, Strangers: Sibling Estrangement and the Road to Reconciliation, Fern Schumer Chapman says children raised in chaotic, abusive, or neglectful families like the one V and I grew up in run the greatest risk of estrangement, often shutting down and numbing themselves to their emotions, which effectively limits all relationships. She adds that poor communication skills modeled by parents who are unable to express feelings, negotiate differences, and model necessary skills of listening, apologizing, or cooling off can also be at the root of estrangement between siblings..."