To the OP. Your ex’s behaviour as you described it is more immature than intimidating. My STBX has diagnosed mental health issues, a castrophic brain injury and assaulted our children. My children have a very poor relationship with him due to HIS violent and remorseless behaviour. They want nothing to do with him and they are justified in their feelings . That being said, I can still get them to talk to him on the phone. I am not responsible for the depth or quality of the conversation once he’s on the phone. I hand the phone to my kid, and say, “it’s your father.” They usually just grunt or give one word answers. Not my problem. I got them on the phone. Then they hand the phone to their sibling... and under the right supervised circumstances where they feel safe I can convince them to see him too.
My children’s voices are loud and clear. They are afraid of and furious with their dad . Due to his total lack of insight and severe cognitive impairment he doesn’t remember what he’s done so he has no remorse. My STBX is truely dangerous through no fault of his own. However, he is still a human being and the father of our children. One of us has to be the adult and it can’t be him. If I, under my horrific circumstances can get the kids to at least grunt on the phone with their dad, I don’t see any reason why you can not.
I doubt very much my children will have much of a relationship if any with my STBX as they get older. That is not my problem. What my job as the only adult in the room is to ensure my children do not grow up with abandonment issues and they learn compassion, respect and how to conduct themselves with grace when being forced to interact with somebody who hurt them and whom they don’t like. This is a valuable life lesson as they will always encounter people in life whom they don’t like.
You need to think about what you want to teach your child.