Minor characters of child called it?

There are quite a few minor characters in A child called it. One of the bigger ones is Dave Pelzer's mother. I guess that it is debateable whether or not she is a main character but i like to classify her under "minor" just because Dave is more important. In the book she is a terrible women who selfishly beats Dave every single day for a total of eight years. She likes to invent games to play with him after school each day that are tortures and evil.