Estate Law Questions? Ask an Estate Lawyer.
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Can you tell me if the trust is revocable or irrevocable (if you know)?
Has mother been declared legally incompetent by a judge and had a guardian appointed?
Has anyone asked mother if brother in law (BIL) if she named him as the successor trustee?
Ok, from a purely legal perspective, if mother has not been declared legally incompetent, then the presumption is that she is still competent. The reason that this is important is because with a revocable trust, until it becomes irrevocable, then the beneficiaries have no legal right to receive information about it from a trustee unless the grantor (maker) wants the trustee to provide info.
Once the trust becomes irrevocable, which happens once the grantor dies or becomes legally incompetent, then this is considered a "material change" in the trust and then the beneficiaries' interests become fixed and they are then entitled to an inventory and accounting at least annually unless the trust states some other frequency. While the grantor is living and competent, they can make any changes that they want to the trust at any time without notifying anyone except the trustee.
So to answer your question directly, no, you wouldn't have the right to see the trust until mother either passes or is declared legally incompetent.