Thanks for the suggestions

Thanks toaall of you who gave me suggestions. And to answer the few questions I got asked here goes.
1. It is my sons house not mine, He allowed me to move in with him when I had to quit work due to my heatlth. My daughter lives here to help out with my granddaughter and to put it buntly me. She moved here from another state after my health tarted failing.
2. My son makes the rules for the house period. We all follow the rules as far as he knows. Any miss behavior on my granddaughter’s part when he is not home gets her sent to her room until he returns or she can behave.
3. My daughter is very careful to include her niece in everything she and her daughter do. And every other week does something with just her niece/ the other week belonging to her daughter. My youngest granddaughter is made to give up a lot of activities that she would normally be allowed to do, because my son wont let his child do them and my daughter feels it would be wrong to let her daughter do them and mabe cause more problems between the girls.( I am trying to convence my daughter to let her’s do the activities she was allowed to perticipate in before moving, as it might help her brother to see it won’t hurt his to do some of them.
As for the school issue my daughter went into the school to discuss a problem with her daughter And in the course of the day talked to the school counsler. The counsler agreed to talk to my granddaughter a couple times and she if she “thinks” the child needs to talk to a counslor more, then recommend it to my son. Of course this was arranged behind his back so the counslor will be ” talking ” to each child in the class room due to a death of a student in the school and then this. Don’t know how ethical it is but it was all we could think of to try.