Manipulating grandma

So me and my ex (broke up due to domestic reasons) broke up 3 years ago, we have two children together and he’s not aloud to see them by a no contact order (he threatened to kill all of us) and told my daughter he was going to stab us all!

So about a year and a half ago I decided to let his parents see the children but on the condition they cant talk about him to the children and no contact (as it was done through court)

Last night my daughter comes home shaken up, so I ask what’s going on and she says her grandma tried getting her to talk to him on the phone and was telling her he missed her etc and that he would never say or do anything to hurt her.

Bare in mind my daughters 8 years old and has done lots of therapy to try and deal with the trauma.

I don’t know if that’s a breach of contract with the grandma but I’m absolutely now certain she will not be seeing the children unless it’s supervised!

I have done everything I can to protect them and make sure they’re happy and safe.

This has made me feel so angry and tbh I just needed a rant.

Has anyone been through this before? 🙄😡