SO's son will be starting school next month. He will be going into the same district that his father and I both attended. In our experiences, if the school at all senses that there is an issue at the child's home, they get CPS involved almost immediately. For example, I have dealt with trichotillomania (compulsively pull out my eyelashes/eyebrows) since I was 9 y/o. The school noticed that I had bare spots and called CPS on my parents...even though my parents were not harming me and I did not say anything to the school. CPS finally stopped dropping by after 1.5 years.
SO's son will be starting kindergarten next month. I guess BM received the list of school supplies needed, and asked SO to purchase everything on the list. He told her he couldn't buy everything, but he would split it 50/50 with her. Well, she did not like this response because she then sent a three page rant to SO. To sum it all up, she basically said: "NO, I'll just buy everything on my own. Just like I buy everything else...the house for him, food, clothes, daycare, health insurance, the after school program...." and it continued.