Hello, I am Rafael. Thanks for asking your question - I'm here to support you. (Information posted here is not private or confidential but public).
Bullying is always abuse regardless of the circumstances.
Nonetheless it is your daughter the one with right and responsibility to take good care of your grandsons. if she chooses to limit access to your grandchildren, there is not much you could do about it. It is absolutely sad and frustrating, and I cannot imagine how painful it feels to be in your shoes.
I am here to support you. I am looking forward to chatting with you here wen possible, thus I could respond to your questions.
Please feel free to join the chat. I will be here waiting for you.