No Trespass

Yesterday afternoon Fake Gangsta put someone's backpack in the bathroom at the end of the day in retaliation for the owner of the backpack stomping on his bag. The backpack wound up in the toilet, not by FG's hand - at least according to him. When this incident came to light, FG was already on his bus to go home so the principal pulled him off the bus to deal with the situation. The assistant principal let his mom know that he was pulled off the bus and that he would need a ride home. FG's mom, someone who is not in the running for parent of the year, said he could walk home. Here's where it gets bad.
Apparently, FG's mom came to the school yesterday evening and blocked the principal's car in his space as he was leaving and screamed at him. She told him that next time the principal pulls FG from the bus, the principal needs to drive him home. The principal didn't like that very much. The principal here is really good with parents and kids alike but he's totally done working with this parent who is out of control. In order to prevent her abusing other staff, he's calling home today to let her know she can't come onto school grounds without an invitation. Good times!
The question at this point is whether FG's 2 year old sister was in the car when mom went nuts in the parking lot and if so, whether this warrants a call to child services. I have to say, I have a lot of anger toward this woman because FG he is such a great kid but his mom just doesn't do any real parenting. If she did, FG would be much, much happier. He suffers from her choice to not parent her child. It's not fair to him and he'll carry it with him for his whole life.