I am not really clear on what the question is here. Can you try to restate it?
If you are the beneficiary of a trust, it may be that the trustee has the right (called "discretion") to decide what amounts you get, but you are entitled to know what the decision is based on and obtain records of the trust.
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You question is not clear.You need to be more clear.
What the family changed? How?Names in accounts don't change overnight .
Was a bank account? A trust? Cash?
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If someone is changing what you were entitled to after the fact they cannot do that. You need to ask for an accounting in writing and I suggest you speak with an attorney to help make sure you are protected.