General rules set-up within families that may cause codependency may include:

It’s not okay to talk about problems
Feelings should not be expressed openly; keep feelings to yourself
Communication is best if indirect; one person acts as messenger between two others; known in therapy as triangulation
Be strong, good, right, perfect
Make us proud beyond realistic expectations
Don’t be selfish
Do as I say not as I do
It’s not okay to play or be playful
Don’t rock the boat.