Sounds like a custody question. You should post it under Child Custody for more responses.
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If you and your wife have split up and she is threatening to move to Boston, you should immediately go to the Nassau Family Court located at 1200 Old Country Road in Mineola and file a visitation petition. When you get a visitation order (temporary or final) make sure that the court includes the provision that mother is not to relocate out of the jurisdiction without getting permission from the court. Although that is the implicit rule anyway, you want the order to explicitly include that term. Good luck with everything.
You do not mention whether the two of you are still living together or are separated. I assume you are separated based on the schedule. If you are no longer living together you should start a custody case in Nassau family Court. Even if you do not win custody you will get a visitation schedule and you can seek an order forbidding her from leaving the vicinity with the children.
Howard E. Knispel, Esq.
The above is a general answer and is not considered legal advice. You should contact an attorney before proceeding to take any legal action, signing any papers or upon service of a summons. Howard E. Knispel 631-864-7589