Parents often interact differently with each sibling, and siblings interact differently with parents. even these experiences occurring within the family can be part of the of siblings.

The answer to the space provided is the shared environment. This comes in when parents, siblings or anyone has something in common or share things that they are a like or things that they have or acquire. It describes the sentence where parents shares one thing in common of how they interact with each sibling in the family and the siblings ways of having things in common in interacting differently with their parents.

There is lots of evidence