What should I do? In this situation?

Hi, fellow witches, I wish you a great day. I need some help from you. The problem seems to be that My grandparents are being verbally and sometimes even physically abused by their daughter in law despite taking legal action. My uncle have tried divorcing her but she didn't stopped. They have a child. That's why my uncle fears what would happen to my cousin if they are divorced. Can I do some protective spell or knot binding spell to protect my grandparents from being abused by that women or make her realize her fault?

I haven't done this type of spell.

So, I don't know how to do it..

Any Ideas, Please help...

Thanks in advance.