All trusts become irrevocable once the settlor dies. You may want to review the trust with an attorney to understand your rights.
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Mr. Harkess is correct. All trusts become irrevocable once someone dies. So, with the death of the grantor, then it can never be modified. I agree with Mr. Harkess to sit down with an attorney to review the trust with you and advise you of your rights. Most of the attorneys in the Denver area would offer either a free or discounted rate initial consultations, depending on the length of the meeting.
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You need to consult with a local attorney to see if your brother had a power to change the trustee under the terms of the trust. If he didnt, he cannot unilaterally do what he did. Consult an estate attorney to determine how to respond and proceed.
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A couple points. An irrevocable can be changed through a court process called decanting. However, to accomplish this the beneficiaries and trustees would have to be in agreement and there must usually be a compelling reason to change the trust at the order of a judge. With that being said in response to your question. I think this issue lies with a clause in the trust agreement called a "power of appointment" which is a limited right to make changes to something.....even in an irrevocable trust....the IRS in fact issued pronouncements where it is permissible to do so.....one of those most common things is changes to a trustee.....as long as no benefit enuresis to the Grantor of the trust. So....cannot tell you for sure without actually seeing the trust agreement but is likely to be the valid reason fir the change instead of actually ignoring something that is not allowable under any circumstance.....the devil is in the details on this one.
My answer is not intended to be giving legal advice and this topic can be a complex area where the advice of a licensed attorney in your State should be obtained.