Need some help with a toxic elderly mother. Any advice?

I take care of my mom 82, my dad 90, in their home for the last 7 years. My son and his family moved out here on the property to find a better life. They have been here for 6 years. And they help me out alot. But my mother does not want them here any more. She is getting mean and violent to my son and his family. They live in a trailer on the property, but teenage grandkids live in the house with me. No room in the trailer. My mom called the police to have me removed from the property. No one has shown up to the house yet. Maybe on monday? Anyway what are my options on dealing with her behavior. My son works full time. So he is not around that much and on his days off he helps me around the property. My grandkids have 4H animals they take care of until fair. So it's not like we can just up and move. One thing is we would need more money to find a place. She does this stuff once a year. She wants to have me all to her self and no noise and no kids. She said its her house and she can do what she wants. I'm at a loss as to how to handle her.