Hello JA Customer,
I am an expert here at Just Answer and I would be happy to answer your question.
Probably the best way to handle this situation would be to bring in your own expert witness to testify at the upcoming hearing regarding your mental health. A psychiatrist or psychologist who can advise the court that you do not have any mental health concerns that would effect your ability to be a good parent is likely the best course of action here. A letter or written document by itself is inadmissible hearsay so you always need to have the person that wrote it, or in some instances, a records custodian available to testify regarding a document you plan to introduce as evidence.
Although it generally doesn't hurt to challenge the opposing party's credibility, the better alternative is to bring your own, more credible witnesses to testify on your own behalf. These witnesses can also include friends, family, employers, etc., depending on the amount of time you have alloted for the hearing.
To ensure that this testimony goes smoothly, I would strongly suggest that you contact a family law attorney licensed to practice in your local jurisdiction. Many attorney's offer free consultations and offer monthly payment arrangements. Also, your attorney can request that the court order your wife to pay your reasonable attorney's fees.
I hope this helps, best of luck!
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