Does the child know how to work the neb? Would she be able to show the father how to work it or is there a “instruction sheet” available from the doctor that you could give with the machine so that he could figure this out himself? Maybe give her treatment early in the day and then he would have until the next day to figure it out.
Since you have not been served yet I don’t think it would cause a problem for you to meet him at his parent’s home. Providing that his parents are sort of neutral. If not then it would be alright to have meet you at the police station. Let the father know that you are doing this for everyone’s sake, not just your own. If your ex is petty enough to bring this up in court, I think that given the current legal situation this would be understandable, even to the judge. I do not suggest that you put yourself in the position to be near the new wife. That has the potential to aggrivate the situation.
You and your children need to know that things may not always be this difficult. The first year is always more difficult because everyone wants things to be as they were. Once things calm down some, the new wife “proves” whatever it is she’s trying to prove with this, the ex realizes that you are not trying to keep the children away from him, it will get easier. It’s possible that the ex’s new wife has “threatened” something against you and/or the children where they could hear and that is why she is worried. I’m glad that you have her in counseling. And you need to make sure that she is able to reach you whenever she needs you.