Yes, your husband can call any witnesses that he wishes. You can't stop him from calling anyone. However, your husband can't have all of them testify one at a time - - you can demand that they all testify separately and you can ask that they all not be allowed in the courtroom if they're not testifying. Also, you can ask that they be held in separate witness rooms before testimony is given.
If you want to seek restraining orders against these people, it is likely that you're better off to seek the restraining orders as soon as you can and possibly have the judge hear your requests for these restraining orders at the same time the other matter is brought up.
Unless you're concerned about your personal safety, you can return to the house get your unless there's an order preventing it. Also, if you do get your restraining orders, they would be prevented from coming to your property.
Yes, the clerk's office is the only way to get a restraining order request filed.
He doesn't have to give you a list before the hearing, but if you want a list, you can ask the judge to continue the hearing and ask for a witness list to be provided before the case resumes.
Also, yes you're entitled to any witnesses or documents that you need - - but not personal notes.
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