Hi. I'm so sorry for your pain.your daughter will do what she wants to do. It may make you feel temporarily better if you yell at her, but it won't change things for the better and she may use the grandchild and not let you see him. Telling her off never worked before.
in my opinion you need to accept who your daughter is, that you can't change her one bit, that she has wrongheaded thinking and that you have no legal grounds to really help your grandson. All you can do is be nice to him when he is with you. If he is smart, his teachers will catch him up.
Good luck!
