There is a metaphor about a boiling pot of crabs. Some of the crabs will try to escape the boiling pot but others will pull them back into the pot. This is how dysfunctional systems and families work. Many time there will be one or two family members trying to escape the system but the other members of the system continue to pull them back into the system and its rules.
This can be seen when there is a family reunion or get together and a person has been away from the family for awhile. When the person is away that person may be successful and confident, but when that person returns to the family system he/she loses all confidence and returns to how he/she was while living with the family. This happens to all of us on a lesser degree or maybe greater in some cases.
Characters will also belong to different systems that expect them to behave in a certain way. When they are around their friends they will act one way that may be different than when they are around their families and even in a different manner when around associates.
We are all pulled into our systems just like the crabs and ironically when we fight against that system we may be in actuality supporting the homeostasis of that system :)