You need to sit down with an attorney and review the emails. The hard part is it sounds like the money is in another country. You will probably need representation in the US and the foreign country.
You do not provide enough information for us to give you much of an answer. Pretend that we know absolutely NOTHING about what you are talking about. Ignoring the foreign assets, (since you have agreed to give them up?), what is left in the US? Why will the other heir not split the US assets, if you have given up the foreign ones? This does not make sense. What is the problem?
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Agree with other attorneys. There is not enough information.
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