What would be the word or explanation to describe when a family keeps one of the family members in the dark?

Question

For instance: The mother of a grown son and daughter tells aunts, uncles, cousins, etc. that the daughter has closed her out of town restaurant. The sister has also told everyone. But it is kept a secret from the brother. The brothers' info is not kept secret from anyone. But the sister and mother keep the brother in the dark on many occassions. I would like to know the underlying psychology of this secretism and the words to describe it.

Answer 1

Exclusionary? That they exclude this brother from family info? Probably not an "official term" but rather descriptive. Did this brother perhaps at some point have "issues" with other family members in the past that you are unaware of, and this is why they chose to keep him out of the loop?