The effect of all of this is that if a child somehow gets to play the role of a good child for a long time, they become an insecure, resentful, depressed, subdued, aloof, and social misfit in their bid to protect themselves from the potentially violent BPD parent.
Ironically, there is no definite pattern of knowing what to expect that will enable the child to know how to conform because the child will get to learn that being classified as a “good child” usually has nothing to do with what they had done or not done, but more to do with how their mother has decided to classify them,